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Make sure all devices on the same Vlan supports jumbo frames or you can
end up with a MTU miss-match which can cause your performance to be even
worse. If you do not hit a layer three device you will not be able to
use the Max path discovery feature built into IP.=20
=20
-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Prashanth
N
Sent: Monday, February 14, 2005 3:28 AM
To: Dale King
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Gigabit performance
=20
As Dale suggested,
enable Jumbo frames on the interface and set the MTU size to 9000. THIS
SHOULD GIVE you better performance
Thank you
Prashanth
Dale King wrote:=20
On Thu, Feb 10, 2005 at 04:44:19PM -0500, Mosseveld, Adriaan wrote:
=20
Our Netbackup infrastructure is based around an E450 with
gigabit
connectivity.
=20
For some reason, it is impossible for us to get a throughput on
the (ge)
Gigabit card of greater than 10Mb/sec. We have tried a direct
connection
between the server and an E220R with a ce gigaswift card, with
exactly the
same results (therefore ruling out the switch).
=20
We have tried using Netbackup, ftp, dd (with remote shell), but
all showed a
similar throughput.
=20
=20
I think you need to look at tuning your TCP stack. Look at your OS
documentation for how to change your TCP send and receive buffers. Also
if your switches can support jumbo frames try turning that on.
=20
A quick google search for gigabit ethernet tuning should turn up some
useful information.
=20
Regards,
Dale
_______________________________________________
Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
=20
=20
=20
=20
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<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Make sure all devices on the same =
Vlan
supports jumbo frames or you can end up with a MTU miss-match which can =
cause
your performance to be even worse. If you do not hit a layer three =
device you
will not be able to use the Max path discovery feature built into IP. =
</span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblack
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma;color:windowtext'>-----Origi=
nal
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b>
veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <b><span =
style=3D'font-weight:
bold'>On Behalf Of </span></b>Prashanth N<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Monday, February =
14, 2005
3:28 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> Dale King<br>
<b><span style=3D'font-weight:bold'>Cc:</span></b>
veritas-bu AT mailman.eng.auburn DOT edu<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> Re: [Veritas-bu] =
Gigabit
performance</span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3D"#000099"
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt'> </span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3D"#000099"
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>As Dale =
suggested,<br>
enable Jumbo frames on the interface and set the MTU size to 9000. THIS =
SHOULD
GIVE you better performance<br>
<br>
Thank you<br>
Prashanth<br>
<br>
<br>
<br>
Dale King wrote: </span></font></p>
<pre style=3D'margin-left:.5in' wrap=3D""><font size=3D2 =
color=3D"#000099"
face=3D"Courier New"><span style=3D'font-size:10.0pt'>On Thu, Feb 10, =
2005 at 04:44:19PM -0500, Mosseveld, Adriaan =
wrote:</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'> </span></font></pre>
<blockquote style=3D'margin-top:5.0pt;margin-bottom:5.0pt' =
type=3Dcite><pre
style=3D'margin-left:.5in' wrap=3D""><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'>Our Netbackup infrastructure is based around =
an E450 with gigabit</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'>connectivity.</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'> </span></font></pre><pre =
style=3D'margin-left:
.5in'><font size=3D2 color=3D"#000099" face=3D"Courier New"><span =
style=3D'font-size:
10.0pt'>For some reason, it is impossible for us to get a throughput on =
the (ge)</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'>Gigabit card of greater than 10Mb/sec. We =
have tried a direct connection</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'>between the server and an E220R with a ce =
gigaswift card, with exactly the</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'>same results (therefore ruling out the =
switch).</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'> </span></font></pre><pre =
style=3D'margin-left:
.5in'><font size=3D2 color=3D"#000099" face=3D"Courier New"><span =
style=3D'font-size:
10.0pt'>We have tried using Netbackup, ftp, dd (with remote shell), but =
all showed a</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'>similar throughput.</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'> =
</span></font></pre></blockquote>
<pre style=3D'margin-left:.5in' wrap=3D""><font size=3D2 =
color=3D"#000099"
face=3D"Courier New"><span =
style=3D'font-size:10.0pt'> </span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'>I think you need to look at tuning your TCP =
stack. Look at your OS</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'>documentation for how to change your TCP send =
and receive buffers. Also</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'>if your switches can support jumbo frames try =
turning that on.</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'> </span></font></pre><pre =
style=3D'margin-left:
.5in'><font size=3D2 color=3D"#000099" face=3D"Courier New"><span =
style=3D'font-size:
10.0pt'>A quick google search for gigabit ethernet tuning should turn up =
some</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'>useful information.</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'> </span></font></pre><pre =
style=3D'margin-left:
.5in'><font size=3D2 color=3D"#000099" face=3D"Courier New"><span =
style=3D'font-size:
10.0pt'>Regards,</span></font></pre><pre =
style=3D'margin-left:.5in'><font size=3D2
color=3D"#000099" face=3D"Courier New"><span =
style=3D'font-size:10.0pt'>Dale</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'>______________________________________________=
_</span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'>Veritas-bu maillist - <a
href=3D"mailto:Veritas-bu AT mailman.eng.auburn DOT edu">Veritas-bu AT mailman
DOT eng.=
auburn.edu</a></span></font></pre><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'><a
href=3D"http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu";>http:/=
/mailman.eng.auburn.edu/mailman/listinfo/veritas-bu</a></span></font></pr=
e><pre
style=3D'margin-left:.5in'><font size=3D2 color=3D"#000099" =
face=3D"Courier New"><span
style=3D'font-size:10.0pt'> </span></font></pre><pre =
style=3D'margin-left:
.5in'><font size=3D2 color=3D"#000099" face=3D"Courier New"><span =
style=3D'font-size:
10.0pt'> </span></font></pre><pre style=3D'margin-left:.5in'><font =
size=3D2
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<br>
</span></font></p>
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