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Date: Wed, 14 Jan 2015 11:29:15 -0200
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 <CAL9LgEO6-WRT_=qVGUzymrxN2VSm1BCmMR1N-+4EXx1MtvUjiQ@mail.gmail.com>
Subject: IO performance
From: Daniel Biazus <daniel.biazus@azion.com>
To: users <users@trafficserver.apache.org>
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Hey Guys,

    As you can see at the following iostat output, We have a lot of writes
into the cache, :-)  and the IO wait is a bit higher than expected.

               Device:         rrqm/s   wrqm/s     r/s     w/s   rsec/s
wsec/s avgrq-sz avgqu-sz   await  svctm  %util
(storage) sda               0.00     0.00   17.00   26.00  6094.00 13144.00
  447.40     0.94   *19.77*   6.05  26.00
(interim)  sdb               0.00     0.00   85.00   13.00 12523.00
 8706.00   216.62     0.18    1.86   0.84   8.20

I was wondering if would be possible to enhance the write IO performance by
increasing the IO buffers.

I thought, I would increase the proxy.config.io.max_buffer_size, from 32768
to a much higher value.

Any thoughts about it ?

Thank you!

--=20

Daniel Biazus
infrastructure Engineering
Azion Technologies
Porto Alegre, Brasil +55 51 3012 3005 | +55 51 82279032
Miami, USA +1 305 704 8816

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<div dir=3D"ltr">Hey Guys,<div><br></div><div>=C2=A0 =C2=A0 As you can see =
at the following iostat output, We have a lot of writes into the cache, :-)=
 =C2=A0and the IO wait is a bit higher than expected.=C2=A0</div><div><br><=
/div><div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Devic=
e: =C2=A0 =C2=A0 =C2=A0 =C2=A0 rrqm/s =C2=A0 wrqm/s =C2=A0 =C2=A0 r/s =C2=
=A0 =C2=A0 w/s =C2=A0 rsec/s =C2=A0 wsec/s avgrq-sz avgqu-sz =C2=A0 await =
=C2=A0svctm =C2=A0%util</div><div>(storage) sda =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 0.00 =C2=A0 =C2=A0 0.00 =C2=A0 17.00 =C2=A0 26.00 =C2=
=A06094.00 13144.00 =C2=A0 447.40 =C2=A0 =C2=A0 0.94 =C2=A0 <b><font color=
=3D"#ff0000">19.77</font></b> =C2=A0 6.05 =C2=A026.00</div><div>(interim) =
=C2=A0sdb =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 0.00 =C2=A0 =C2=
=A0 0.00 =C2=A0 85.00 =C2=A0 13.00 12523.00 =C2=A08706.00 =C2=A0 216.62 =C2=
=A0 =C2=A0 0.18 =C2=A0 =C2=A01.86 =C2=A0 0.84 =C2=A0 8.20</div><div><br></d=
iv><div>I was wondering if would be possible to enhance the write IO perfor=
mance by increasing the IO buffers.</div><div><br></div><div>I thought, I w=
ould increase the=C2=A0<span style=3D"color:rgb(0,0,0)">proxy.config.io.max=
_buffer_size, from 32768 to a much higher value.=C2=A0</span></div><div><sp=
an style=3D"color:rgb(0,0,0)"><br></span></div><div><span style=3D"color:rg=
b(0,0,0)">Any thoughts about it ?</span></div><div><span style=3D"color:rgb=
(0,0,0)"><br></span></div><div><font color=3D"#000000">Thank you!</font></d=
iv><div><br></div>-- <br><div class=3D"gmail_signature"><div dir=3D"ltr"><h=
1 style=3D"font-family:Arial;font-size:14px;margin-bottom:10px;color:rgb(68=
,68,71)"><br></h1><div><div style=3D"color:rgb(0,0,0);font-family:Arial;fon=
t-size:medium;height:7px;width:0px;border-left-width:15px;border-left-style=
:solid;border-left-color:rgb(239,101,47);border-right-width:7px;border-righ=
t-style:solid;border-right-color:rgb(247,183,160);margin-bottom:15px"></div=
><div style=3D"color:rgb(0,0,0);font-family:Arial,Helvetica,sans-serif;font=
-size:14px;font-weight:bold">Daniel Biazus</div><div style=3D"color:rgb(0,0=
,0);font-family:Arial,Helvetica,sans-serif;font-size:12px">infrastructure E=
ngineering</div><div style=3D"margin:1em 0px 0px;font-family:Arial,Helvetic=
a,sans-serif;color:rgb(239,101,47)">Azion Technologies</div><div style=3D"c=
olor:rgb(0,0,0);margin:0.25em 0px;font-family:Arial,Helvetica,sans-serif;fo=
nt-size:11px">Porto Alegre, Brasil=C2=A0+55 51 3012 3005=C2=A0|=C2=A0+55 51=
 82279032</div><div style=3D"color:rgb(0,0,0);margin:0.25em 0px;font-family=
:Arial,Helvetica,sans-serif;font-size:11px">Miami, USA +1 305 704 8816</div=
><table border=3D"0" cellspacing=3D"0" cellpadding=3D"0" style=3D"font-fami=
ly:Arial;max-width:500px"><tbody><tr><td><br><p style=3D"font-size:10px">Qu=
aisquer informa=C3=A7=C3=B5es contidas neste e-mail e anexos podem ser conf=
idenciais e privilegiadas, protegidas por sigilo legal. Qualquer forma de u=
tiliza=C3=A7=C3=A3o deste documento depende de autoriza=C3=A7=C3=A3o do emi=
ssor, sujeito as penalidades cab=C3=ADveis.</p><p style=3D"font-size:10px;m=
argin-top:10px">Any information in this e-mail and attachments may be confi=
dential and privileged, protected by legal confidentiality. The use of this=
 document require authorization by the issuer, subject to penalties.</p></t=
d></tr></tbody></table><br style=3D"color:rgb(0,0,0);font-family:Arial;font=
-size:medium"></div></div></div>
</div></div>

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