Re: Poor UDP performance using 2.6.21-rc5-rt5

2007-04-01 Thread Ingo Molnar
* Ingo Molnar <[EMAIL PROTECTED]> wrote: > one thing to check would be whether both kernels use the same > clocksource, via: > > cat /sys/devices/system/clocksource/clocksource0/current_clocksource > > but at first sight there's no clocksource related overhead in the > oprofile. i've starte

Re: Poor UDP performance using 2.6.21-rc5-rt5

2007-04-01 Thread Ingo Molnar
* Nivedita Singhvi <[EMAIL PROTECTED]> wrote: > Dave Sperry wrote: > >Hi > > (adding netdev to cc list) in general (except of course those netdev folks that are interested in -rt+networking performance matters) i'd suggest we analyze this in an -rt specific way - netdev shouldnt have to bothe

Re: Poor UDP performance using 2.6.21-rc5-rt5

2007-04-01 Thread Dave Sperry
Nivedita Singhvi wrote: Dave Sperry wrote: Hi (adding netdev to cc list) I have a dual core Opteron machine that exhibits poor UDP performance (RT consumes more than 2X cpu) with the 2.6.21-rc5-rt5 as compared to 2.6.21-rc5. Top shows the IRQ handler consuming a lot of CPU. Dave, any chan

Re: Poor UDP performance using 2.6.21-rc5-rt5

2007-04-01 Thread Nivedita Singhvi
Dave Sperry wrote: Hi (adding netdev to cc list) I have a dual core Opteron machine that exhibits poor UDP performance (RT consumes more than 2X cpu) with the 2.6.21-rc5-rt5 as compared to 2.6.21-rc5. Top shows the IRQ handler consuming a lot of CPU. Dave, any chance you've got oprofile wo