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Old 09-17-2007, 09:32 AM   #1
Brad.Scalio@noaa.gov
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Registered: Jan 2007
Location: Washington DC
Distribution: RedHat & spins ... Fedora, CentOS, Mandriva
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Making TSO option persistent across reboot??


Greetings

Have had some issues with tcp segmentation offloading on 2.6.9-42.19 RHEL WS kernel using a BCM57xx series NIC. After turning off TSO on the interface things settled down significantly and although it slightly reduces the performance it is an acceptable loss over having the interface drop anytime there is a large transfer.

So, running: ethtool -K eth0 tso off

turns it off but it is a runtime parameter and isn't persistent across reboots, I didn't find anything in /etc/sysctl.conf to change this option permanently and I could just put this into the startup scripts but was wondering if anyone knew of a place to "properly" set this.

Thanks
 
Old 09-17-2007, 09:59 AM   #2
rossonieri#1
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Registered: Jun 2007
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Quote:
Originally Posted by Brad.Scalio@noaa.gov View Post
Greetings

Have had some issues with tcp segmentation offloading on 2.6.9-42.19 RHEL WS kernel using a BCM57xx series NIC. After turning off TSO on the interface things settled down significantly and although it slightly reduces the performance it is an acceptable loss over having the interface drop anytime there is a large transfer.

So, running: ethtool -K eth0 tso off

turns it off but it is a runtime parameter and isn't persistent across reboots, I didn't find anything in /etc/sysctl.conf to change this option permanently and I could just put this into the startup scripts but was wondering if anyone knew of a place to "properly" set this.

Thanks

hi,

try put ethtool -K eth0 tso off in /etc/rc.local,
so next boot it will be automatically executed.

HTH.
 
Old 09-17-2007, 10:00 AM   #3
Brad.Scalio@noaa.gov
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Registered: Jan 2007
Location: Washington DC
Distribution: RedHat & spins ... Fedora, CentOS, Mandriva
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Quote:
Originally Posted by rossonieri#1 View Post
hi,

try put ethtool -K eth0 tso off in /etc/rc.local,
so next boot it will be automatically executed.

HTH.
Howdy

Yeah I figured I could do that - but wasn't sure if there was some obscure sysctl option somewhere that "should" be set ;-)

I already have that in there ... I decided since we pay for RedHat support might as well pass this by them and see what they say -- if it is anything other than the rc.local option (which I doubt) I will post it in case anyone else has the issue(s)

THANKS FOR THE QUICK REPLY
much appreciated

Brad
 
  


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