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In-Reply-To: <1B1E129E-7BA7-438D-B38F-90C0E4A47933@ietcombustion.com>
From: Matt Simmons <bandman@gmail.com>
Date: Wed, 13 Sep 2017 05:20:22 +0000
Message-ID: <CAL0sVA_yz3yA0NmaYzkF0kzeXesXWV_SgNiaSGBkq71tiQiwKA@mail.gmail.com>
Subject: Re: Subversion svn+ssh, sshd 100% CPU
To: Zoran Petkovic <zoran@ietcombustion.com>,
	"users@subversion.apache.org" <users@subversion.apache.org>
Content-Type: multipart/alternative; boundary="001a113e6da8ab0e8405590b5106"
archived-at: Wed, 13 Sep 2017 05:20:39 -0000

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Why does iostat show? Could it be that your underlying disk is io-saturated
and your CPU spike is due to iowait?


On Tue, Sep 12, 2017 at 12:14 PM Zoran Petkovic <zoran@ietcombustion.com>
wrote:

> In the past few days I have been doing extensive testing of Subversion
> with different clients, operating systems, client and server versions and
> have noticed very strange behaviour with windows clients connecting to
> Linux servers, hitting them with excessive CPU usage on the sshd process,
> where the Linux clients do not exhibit this behaviour.
>
>
>
> A sample test setup is as follows:
>
> Server Linux Ubuntu 16.04.3 LTS, OpenSSH_7.2p2 Ubuntu-4ubuntu2.2, OpenSSL
> 1.0.2g  1 Mar 2016, Subversion version 1.9.3 (and 1.9.7).
>
> Client TortoiseSVN 1.9.7
>
>
>
> When checking out large repositories the linux server is hit on the sshd
> process, the process running with 100% cpu usage. This in effect slows down
> the performance and ultimately the speed at which the checkout runs. Linux
> clients connecting to the same server do not cause this load on the server.
>
>
>
> This happens even when compressions is turned off and when encryption
> Cyphers are changed, as well as different versions of subversion. The
> behaviour is identical. I'm not sure who to address for this issue as this
> not only happens with TortoiseSVN but with SlikSVN as well. Any direction
> would be appreciated.
>
>
>
> Regards,
>
>
>
> --
>
> Zoran Petkovic
>
>
>
-- 
"Today, vegetables... Tomorrow, the world!"

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Content-Type: text/html; charset="UTF-8"
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<div><div dir=3D"auto">Why does iostat show? Could it be that your underlyi=
ng disk is io-saturated and your CPU spike is due to iowait?</div><div dir=
=3D"auto"><br></div><div dir=3D"auto"><br></div><br><div class=3D"gmail_quo=
te"><div>On Tue, Sep 12, 2017 at 12:14 PM Zoran Petkovic &lt;<a href=3D"mai=
lto:zoran@ietcombustion.com">zoran@ietcombustion.com</a>&gt; wrote:<br></di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:=
1px #ccc solid;padding-left:1ex">


<div bgcolor=3D"white" lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"m_1429429734180436150WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-AU" style=3D"font-size:11.0pt">In t=
he past few days I have been doing extensive testing of Subversion with dif=
ferent clients, operating systems, client and server versions and have noti=
ced very strange behaviour with windows
 clients connecting to Linux servers, hitting them with excessive CPU usage=
 on the sshd process, where the Linux clients do not exhibit this behaviour=
.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-AU" style=3D"font-size:11.0pt"><u><=
/u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-AU" style=3D"font-size:11.0pt">A sa=
mple test setup is as follows:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-AU" style=3D"font-size:11.0pt">Serv=
er Linux Ubuntu 16.04.3 LTS, OpenSSH_7.2p2 Ubuntu-4ubuntu2.2, OpenSSL 1.0.2=
g=C2=A0 1 Mar 2016, Subversion version 1.9.3 (and 1.9.7).<u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-AU" style=3D"font-size:11.0pt">Clie=
nt TortoiseSVN 1.9.7<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-AU" style=3D"font-size:11.0pt"><u><=
/u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-AU" style=3D"font-size:11.0pt">When=
 checking out large repositories the linux server is hit on the sshd proces=
s, the process running with 100% cpu usage. This in effect slows down the p=
erformance and ultimately the speed at
 which the checkout runs. Linux clients connecting to the same server do no=
t cause this load on the server.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-AU" style=3D"font-size:11.0pt"><u><=
/u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-AU" style=3D"font-size:11.0pt">This=
 happens even when compressions is turned off and when encryption Cyphers a=
re changed, as well as different versions of subversion. The behaviour is i=
dentical. I&#39;m not sure who to address
 for this issue as this not only happens with TortoiseSVN but with SlikSVN =
as well. Any direction would be appreciated.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-AU" style=3D"font-size:11.0pt"><u><=
/u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-AU" style=3D"font-size:11.0pt">Rega=
rds,<u></u><u></u></span></p></div></div><div bgcolor=3D"white" lang=3D"EN-=
US" link=3D"#0563C1" vlink=3D"#954F72"><div class=3D"m_1429429734180436150W=
ordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-AU" style=3D"font-size:11.0pt"><u><=
/u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;">--=C2=A0<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;">Zoran Petkovic<u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-AU"><u></u>=C2=A0<u></u></span></p>
</div></div></blockquote></div></div><div dir=3D"ltr">-- <br></div><div cla=
ss=3D"gmail_signature" data-smartmail=3D"gmail_signature">&quot;Today, vege=
tables... Tomorrow, the world!&quot;=C2=A0</div>

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