From user-return-64597-archive-asf-public=cust-asf.ponee.io@cassandra.apache.org Mon Oct 21 20:53:49 2019 Return-Path: X-Original-To: archive-asf-public@cust-asf.ponee.io Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [207.244.88.153]) by mx-eu-01.ponee.io (Postfix) with SMTP id C9D0B180626 for ; Mon, 21 Oct 2019 22:53:48 +0200 (CEST) Received: (qmail 55990 invoked by uid 500); 21 Oct 2019 20:53:43 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 55980 invoked by uid 99); 21 Oct 2019 20:53:43 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd4-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 21 Oct 2019 20:53:43 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd4-us-west.apache.org (ASF Mail Server at spamd4-us-west.apache.org) with ESMTP id 0C5F3C0CEF for ; Mon, 21 Oct 2019 20:53:43 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd4-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=0 tagged_above=-999 required=6.31 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.2, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=disabled Authentication-Results: spamd4-us-west.apache.org (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mx1-ec2-va.apache.org ([10.40.0.8]) by localhost (spamd4-us-west.apache.org [10.40.0.11]) (amavisd-new, port 10024) with ESMTP id aNfe67sDnAmF for ; Mon, 21 Oct 2019 20:53:41 +0000 (UTC) Received-SPF: Pass (mailfrom) identity=mailfrom; client-ip=209.85.167.54; helo=mail-lf1-f54.google.com; envelope-from=lapostadisergio@gmail.com; receiver= Received: from mail-lf1-f54.google.com (mail-lf1-f54.google.com [209.85.167.54]) by mx1-ec2-va.apache.org (ASF Mail Server at mx1-ec2-va.apache.org) with ESMTPS id 1FD49BC854 for ; Mon, 21 Oct 2019 20:53:41 +0000 (UTC) Received: by mail-lf1-f54.google.com with SMTP id 21so2282671lft.10 for ; Mon, 21 Oct 2019 13:53:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=kmj18S5cmUdDm7IqvvXp+T9yBQKkZnmsvNKequAu3TE=; b=BWR2cRsyZzESB8LvP+khEtB+yxJNLKQ0n3gD517DMysFBX4SEA+/Yxc+WmepiZKmo2 sr9Kdo7ZjPIoL+YaoWNKMQXCicIUqK9GHRgiLTtylcEFFyi+kxEO9piWiXQbxTkP37zI 2C/EGr3ZLepk767rE0exQy04VgBp+/Vv+hT/moSgPvQHtBQA0G0btO3DSR9uABIXPmbJ E0ZlYoC1eQUcG2irEbwd07s7Ju/wUUbdwdv2U/tBmjF/prKkS4diV8Fuol3oVMYkC1pY AW8TPmKumIFVptdf0v7lhoEgVqz++UlGfpmjYb7hh+Fkl+j9OQEnfIUpl+DXJoLSOpaW zfxg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=kmj18S5cmUdDm7IqvvXp+T9yBQKkZnmsvNKequAu3TE=; b=bp2vgZGDh0BaclQDSfVOwa60NTcrpWb2jBUWLXVqQ+P6UkLAOE2o7wAvF1dd1NzkEh m72hCQGKdirit0ujmzfoxdL8BdhLLq85pbgKHcwT0agWN15EoY+8kIEtGO3PoLvr8hS7 TIrA8rz0HCZncHsaZNCoih7Iu0F9bmxa7CJLjNKsZlO9GSCwYbBHk/a3gf/QgSsT1JCw bYyBiyOyji3b/U9fJsYsVLa50tLwtSuUdBOGwwyAK7uYL3ORFoQWrG0ZIdIiZ9xKCf10 2asXLkgy3q5u3N3W+bboIUyq7leXLaHjqiyR+b+VAwCsDV+UQy07rwacq9RTEXwUSfM7 ppUA== X-Gm-Message-State: APjAAAWjmIUKSC8jvYqohcX05qQN9Hj18CYTfno9ktWTbM+jBcc/xMUE iQ+YX24XlQX6wQQ8FViNN8CBDI0XcOjQjl8bF5Q7gTLm X-Google-Smtp-Source: APXvYqzEpVSTIQyDxQs/3yqab//zUNL3jW0Ki/SB37tbnwMOEzAgFtwGTP4oBUhnCH3YY7l+8QbffWmsM/4ZtaQTyz4= X-Received: by 2002:ac2:5de9:: with SMTP id z9mr7701030lfq.5.1571691219643; Mon, 21 Oct 2019 13:53:39 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Sergio Date: Mon, 21 Oct 2019 13:53:26 -0700 Message-ID: Subject: Re: Cassandra Recommended System Settings To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary="000000000000d7f293059571e0ba" --000000000000d7f293059571e0ba Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Thanks Elliott! How do you know if there is too much RAM used for those settings? Which metrics do you keep track of? What would you recommend instead? Best, Sergio On Mon, Oct 21, 2019, 1:41 PM Elliott Sims wrote: > Based on my experiences, if you have a new enough kernel I'd strongly > suggest switching the TCP scheduler algorithm to BBR. I've found the res= t > tend to be extremely sensitive to even small amounts of packet loss among > cluster members where BBR holds up well. > > High ulimits for basically everything are probably a good idea, although > "unlimited" may not be purely optimal for all cases. > The TCP keepalive settings are probably only necessary for traffic > buggy/misconfigured firewalls, but shouldn't really do any harm on a mode= rn > fast network. > > The TCP memory settings are pretty aggressive and probably result in > unnecessary RAM usage. > The net.core.rmem_default/net.core.wmem_default settings are overridden b= y > the TCP-specific settings as far as I know, so they're not really > relevant/helpful for Cassandra > The net.ipv4.tcp_rmem/net.ipv4.tcp_wmem max settings are pretty > aggressive. That works out to something like 1Gbps with 130ms latency pe= r > TCP connection, but on a local LAN with latencies <1ms it's enough buffer > for over 100Gbps per TCP session. A much smaller value will probably mak= e > more sense for most setups. > > > On Mon, Oct 21, 2019 at 10:21 AM Sergio wrote= : > >> >> Hello! >> >> This is the kernel that I am using >> Linux 4.16.13-1.el7.elrepo.x86_64 #1 SMP Wed May 30 14:31:51 EDT 2018 >> x86_64 x86_64 x86_64 GNU/Linux >> >> Best, >> >> Sergio >> >> Il giorno lun 21 ott 2019 alle ore 07:30 Reid Pinchback < >> rpinchback@tripadvisor.com> ha scritto: >> >>> I don't know which distro and version you are using, but watch out for >>> surprises in what vm.swappiness=3D0 means. In older kernels it means "= only >>> use swap when desperate". I believe that newer kernels changed to have= 1 >>> mean that, and 0 means to always use the oomkiller. Neither situation = is >>> strictly good or bad, what matters is what you intend the system behavi= or >>> to be in comparison with whatever monitoring/alerting you have put in p= lace. >>> >>> R >>> >>> >>> =EF=BB=BFOn 10/18/19, 9:04 PM, "Sergio Bilello" >>> wrote: >>> >>> Message from External Sender >>> >>> Hello everyone! >>> >>> >>> >>> Do you have any setting that you would change or tweak from the >>> below list? >>> >>> >>> >>> sudo cat /proc/4379/limits >>> >>> Limit Soft Limit Hard Limit >>> Units >>> >>> Max cpu time unlimited unlimited >>> seconds >>> >>> Max file size unlimited unlimited >>> bytes >>> >>> Max data size unlimited unlimited >>> bytes >>> >>> Max stack size unlimited unlimited >>> bytes >>> >>> Max core file size unlimited unlimited >>> bytes >>> >>> Max resident set unlimited unlimited >>> bytes >>> >>> Max processes 32768 32768 >>> processes >>> >>> Max open files 1048576 1048576 >>> files >>> >>> Max locked memory unlimited unlimited >>> bytes >>> >>> Max address space unlimited unlimited >>> bytes >>> >>> Max file locks unlimited unlimited >>> locks >>> >>> Max pending signals unlimited unlimited >>> signals >>> >>> Max msgqueue size unlimited unlimited >>> bytes >>> >>> Max nice priority 0 0 >>> >>> Max realtime priority 0 0 >>> >>> Max realtime timeout unlimited unlimited >>> us >>> >>> >>> >>> These are the sysctl settings >>> >>> default['cassandra']['sysctl'] =3D { >>> >>> 'net.ipv4.tcp_keepalive_time' =3D> 60, >>> >>> 'net.ipv4.tcp_keepalive_probes' =3D> 3, >>> >>> 'net.ipv4.tcp_keepalive_intvl' =3D> 10, >>> >>> 'net.core.rmem_max' =3D> 16777216, >>> >>> 'net.core.wmem_max' =3D> 16777216, >>> >>> 'net.core.rmem_default' =3D> 16777216, >>> >>> 'net.core.wmem_default' =3D> 16777216, >>> >>> 'net.core.optmem_max' =3D> 40960, >>> >>> 'net.ipv4.tcp_rmem' =3D> '4096 87380 16777216', >>> >>> 'net.ipv4.tcp_wmem' =3D> '4096 65536 16777216', >>> >>> 'net.ipv4.ip_local_port_range' =3D> '10000 65535', >>> >>> 'net.ipv4.tcp_window_scaling' =3D> 1, >>> >>> 'net.core.netdev_max_backlog' =3D> 2500, >>> >>> 'net.core.somaxconn' =3D> 65000, >>> >>> 'vm.max_map_count' =3D> 1048575, >>> >>> 'vm.swappiness' =3D> 0 >>> >>> } >>> >>> >>> >>> Am I missing something else? >>> >>> >>> >>> Do you have any experience to configure CENTOS 7 >>> >>> for >>> >>> JAVA HUGE PAGES >>> >>> >>> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__docs.datastax.co= m_en_dse_5.1_dse-2Dadmin_datastax-5Fenterprise_config_configRecommendedSett= ings.html-23CheckJavaHugepagessettings&d=3DDwIBaQ&c=3D9Hv6XPedRSA-5PSECC38X= 80c1h60_XWA4z1k_R1pROA&r=3DOIgB3poYhzp3_A7WgD7iBCnsJaYmspOa2okNpf6uqWc&m=3D= zke-WpkD1c6Qt1cz8mJG0ZQ37h8kezqknMSnerQhXuU&s=3Db6lGdbtv1SN9opBsIOFRT6IX6Br= oMW-8Tudk9qEh3bI&e=3D >>> >>> >>> >>> OPTIMIZE SSD >>> >>> >>> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__docs.datastax.co= m_en_dse_5.1_dse-2Dadmin_datastax-5Fenterprise_config_configRecommendedSett= ings.html-23OptimizeSSDs&d=3DDwIBaQ&c=3D9Hv6XPedRSA-5PSECC38X80c1h60_XWA4z1= k_R1pROA&r=3DOIgB3poYhzp3_A7WgD7iBCnsJaYmspOa2okNpf6uqWc&m=3Dzke-WpkD1c6Qt1= cz8mJG0ZQ37h8kezqknMSnerQhXuU&s=3Dc0S3S3V_0YHVMx2I-pyOh24MiQs1D-L73JytaSw64= 8M&e=3D >>> >>> >>> >>> >>> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__docs.datastax.co= m_en_dse_5.1_dse-2Dadmin_datastax-5Fenterprise_config_configRecommendedSett= ings.html&d=3DDwIBaQ&c=3D9Hv6XPedRSA-5PSECC38X80c1h60_XWA4z1k_R1pROA&r=3DOI= gB3poYhzp3_A7WgD7iBCnsJaYmspOa2okNpf6uqWc&m=3Dzke-WpkD1c6Qt1cz8mJG0ZQ37h8ke= zqknMSnerQhXuU&s=3DPZFG6SXF6dL5LRJ-aUoidHnnLGpKPbpxdKstM8M9JMk&e=3D >>> >>> >>> >>> We are using AWS i3.xlarge instances >>> >>> >>> >>> Thanks, >>> >>> >>> >>> Sergio >>> >>> >>> >>> -------------------------------------------------------------------= -- >>> >>> To unsubscribe, e-mail: user-unsubscribe@cassandra.apache.org >>> >>> For additional commands, e-mail: user-help@cassandra.apache.org >>> >>> >>> >>> >>> >>> --000000000000d7f293059571e0ba Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Thanks Elliott!

How do you know if there is too much RAM used for those settings?
=

Which metrics do you keep tra= ck of?

What would you re= commend instead?

Best,

Sergio

On Mon, Oct 2= 1, 2019, 1:41 PM Elliott Sims <= elliott@backblaze.com> wrote:
Based on my experiences, if you have a new eno= ugh kernel I'd strongly suggest switching the TCP scheduler algorithm t= o BBR.=C2=A0 I've found the rest tend to be extremely sensitive to even= small amounts of packet loss among cluster members where BBR holds up well= .

High ulimits for basically everything are probably a good id= ea, although "unlimited" may not be purely optimal for all cases.=
The TCP keepalive settings are probably only necessary for t= raffic buggy/misconfigured firewalls, but shouldn't really do any harm = on a modern fast network.

The TCP memory settings are pre= tty aggressive and probably result in unnecessary RAM usage.=C2=A0
The = net.core.rmem_default/net.core.wmem_default settings are overridden by the = TCP-specific settings as far as I know, so they're not really relevant/= helpful for Cassandra
The net.ipv4.tcp_rmem/net.ipv4.tcp_wmem= max settings are pretty aggressive.=C2=A0 That works out to something like= 1Gbps with 130ms latency per TCP connection, but on a local LAN with laten= cies <1ms it's enough buffer for over 100Gbps per TCP session.=C2=A0= A much smaller value will probably make more sense for most setups.=C2=A0 =


On Mon, Oct 21, 2019 at 10:21 AM Sergio <lapostadisergio@gmail.com> wrote:

Hello!

This is the ke= rnel that I am using=C2=A0
Linux=C2=A0 4.16.13-1.el7.elrepo.x86_64 #1 SM= P Wed May 30 14:31:51 EDT 2018 x86_64 x86_64 x86_64 GNU/Linux

Best,<= br>
Sergio

Il giorno lun 21 ott 2019 alle ore 07:30 Reid Pinchback <rpinchback@tripadvisor.com> ha scritto:
I don't know which distro and vers= ion you are using, but watch out for surprises in what vm.swappiness=3D0 me= ans.=C2=A0 In older kernels it means "only use swap when desperate&quo= t;.=C2=A0 I believe that newer kernels changed to have 1 mean that, and 0 m= eans to always use the oomkiller.=C2=A0 Neither situation is strictly good = or bad, what matters is what you intend the system behavior to be in compar= ison with whatever monitoring/alerting you have put in place.

R


=EF=BB=BFOn 10/18/19, 9:04 PM, "Sergio Bilello" <lapost= adisergio@gmail.com> wrote:

=C2=A0 =C2=A0 =C2=A0Message from External Sender

=C2=A0 =C2=A0 Hello everyone!



=C2=A0 =C2=A0 Do you have any setting that you would change or tweak from t= he below list?



=C2=A0 =C2=A0 sudo cat /proc/4379/limits

=C2=A0 =C2=A0 Limit=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0Soft Limit=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hard= Limit=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Units

=C2=A0 =C2=A0 Max cpu time=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = unlimited=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlimited=C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 seconds

=C2=A0 =C2=A0 Max file size=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= unlimited=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlimited=C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 bytes

=C2=A0 =C2=A0 Max data size=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= unlimited=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlimited=C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 bytes

=C2=A0 =C2=A0 Max stack size=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlim= ited=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlimited=C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 bytes

=C2=A0 =C2=A0 Max core file size=C2=A0 =C2=A0 =C2=A0 =C2=A0 unlimited=C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlimited=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 bytes

=C2=A0 =C2=A0 Max resident set=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlimited= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlimited=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 bytes

=C2=A0 =C2=A0 Max processes=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= 32768=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 32768=C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 processes

=C2=A0 =C2=A0 Max open files=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 10485= 76=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 1048576=C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 files

=C2=A0 =C2=A0 Max locked memory=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0unlimited= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlimited=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 bytes

=C2=A0 =C2=A0 Max address space=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0unlimited= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlimited=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 bytes

=C2=A0 =C2=A0 Max file locks=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlim= ited=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlimited=C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 locks

=C2=A0 =C2=A0 Max pending signals=C2=A0 =C2=A0 =C2=A0 =C2=A0unlimited=C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlimited=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 signals

=C2=A0 =C2=A0 Max msgqueue size=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0unlimited= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlimited=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 bytes

=C2=A0 =C2=A0 Max nice priority=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A00=C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 0

=C2=A0 =C2=A0 Max realtime priority=C2=A0 =C2=A0 =C2=A00=C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 0

=C2=A0 =C2=A0 Max realtime timeout=C2=A0 =C2=A0 =C2=A0 unlimited=C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 unlimited=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 us



=C2=A0 =C2=A0 These are the sysctl settings

=C2=A0 =C2=A0 default['cassandra']['sysctl'] =3D {

=C2=A0 =C2=A0 =C2=A0 =C2=A0 'net.ipv4.tcp_keepalive_time' =3D> 6= 0,

=C2=A0 =C2=A0 =C2=A0 =C2=A0 'net.ipv4.tcp_keepalive_probes' =3D>= 3,

=C2=A0 =C2=A0 =C2=A0 =C2=A0 'net.ipv4.tcp_keepalive_intvl' =3D> = 10,

=C2=A0 =C2=A0 =C2=A0 =C2=A0 'net.core.rmem_max' =3D> 16777216,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 'net.core.wmem_max' =3D> 16777216,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 'net.core.rmem_default' =3D> 1677721= 6,

=C2=A0 =C2=A0 =C2=A0 =C2=A0 'net.core.wmem_default' =3D> 1677721= 6,

=C2=A0 =C2=A0 =C2=A0 =C2=A0 'net.core.optmem_max' =3D> 40960,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 'net.ipv4.tcp_rmem' =3D> '4096 8= 7380 16777216',

=C2=A0 =C2=A0 =C2=A0 =C2=A0 'net.ipv4.tcp_wmem' =3D> '4096 6= 5536 16777216',

=C2=A0 =C2=A0 =C2=A0 =C2=A0 'net.ipv4.ip_local_port_range' =3D> = '10000 65535',

=C2=A0 =C2=A0 =C2=A0 =C2=A0 'net.ipv4.tcp_window_scaling' =3D> 1= ,

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0'net.core.netdev_max_backlog&#= 39; =3D> 2500,

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0'net.core.somaxconn' =3D&g= t; 65000,

=C2=A0 =C2=A0 =C2=A0 =C2=A0 'vm.max_map_count' =3D> 1048575,

=C2=A0 =C2=A0 =C2=A0 =C2=A0 'vm.swappiness' =3D> 0

=C2=A0 =C2=A0 }



=C2=A0 =C2=A0 Am I missing something else?



=C2=A0 =C2=A0 Do you have any experience to configure CENTOS 7

=C2=A0 =C2=A0 for

=C2=A0 =C2=A0 JAVA HUGE PAGES

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=C2=A0 =C2=A0 We are using AWS i3.xlarge instances



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=C2=A0 =C2=A0 Sergio



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