Device polling, with SMP?
Has anyone here used DEVICE_POLLING on an SMP box? I have one server which does recieve ~130kpps at times on an interface, but I cannot enable DEVICE_POLLING because hte system locks up under load from interrupts. In this case I'm not sure which is better, disabling one of the CPU's, or trying to make DECIVE_POLLING work with SMP. I read Luigi's paper at info.iet.unipi.it/~luigi/polling/ which at the end implies that DEVICE_POLLING on an SMP box might not make sense - but right now for me it would make sense as both CPU's are locked: One tries to handle interrupts The other tries to manage the application I could try forcing DEVICE_POLLING to compile as is suggested in that URL but I wanted to see if anyone had tried this before. The interface is an FXP. Thanks :) -- Avleen Vig Systems Administrator Personal: www.silverwraith.com EFnet:irc.mindspring.com (Earthlink user access only) ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
RE: Device polling, with SMP?
From: Avleen Vig [mailto:[EMAIL PROTECTED] Has anyone here used DEVICE_POLLING on an SMP box? I have one server which does recieve ~130kpps at times on an interface, but I cannot enable DEVICE_POLLING because hte system locks up under load from interrupts. In this case I'm not sure which is better, disabling one of the CPU's, or trying to make DECIVE_POLLING work with SMP. I read Luigi's paper at info.iet.unipi.it/~luigi/polling/ which at the end implies that DEVICE_POLLING on an SMP box might not make sense - but right now for me it would make sense as both CPU's are locked: One tries to handle interrupts The other tries to manage the application I could try forcing DEVICE_POLLING to compile as is suggested in that URL but I wanted to see if anyone had tried this before. The interface is an FXP. We use it on em. I just commented out the #error line that says you can't do it. device polling in idle doesn't work, and the user/system time calculation isn't correct, but it works well otherwise. --don ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Device polling, with SMP?
On Thu, Nov 20, 2003 at 12:58:58PM -0500, Don Bowman wrote: I read Luigi's paper at info.iet.unipi.it/~luigi/polling/ which at the end implies that DEVICE_POLLING on an SMP box might not make sense - but right now for me it would make sense as both CPU's are locked: One tries to handle interrupts The other tries to manage the application I could try forcing DEVICE_POLLING to compile as is suggested in that URL but I wanted to see if anyone had tried this before. The interface is an FXP. We use it on em. I just commented out the #error line that says you can't do it. device polling in idle doesn't work, and the user/system time calculation isn't correct, but it works well otherwise. This is pretty much what I wanted to confirm thanks! In which way is the system/user time incorrect? Always, or only under high load? what about it is incorrect? My skills are limited but I might take a stab at fixing that. -- Avleen Vig Systems Administrator Personal: www.silverwraith.com EFnet:irc.mindspring.com (Earthlink user access only) ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
RE: Device polling, with SMP?
From: Avleen Vig [mailto:[EMAIL PROTECTED] On Thu, Nov 20, 2003 at 12:58:58PM -0500, Don Bowman wrote: I read Luigi's paper at info.iet.unipi.it/~luigi/polling/ which at the end implies that DEVICE_POLLING on an SMP box might not make sense - but right now for me it would make sense as both CPU's are locked: One tries to handle interrupts The other tries to manage the application I could try forcing DEVICE_POLLING to compile as is suggested in that URL but I wanted to see if anyone had tried this before. The interface is an FXP. We use it on em. I just commented out the #error line that says you can't do it. device polling in idle doesn't work, and the user/system time calculation isn't correct, but it works well otherwise. This is pretty much what I wanted to confirm thanks! In which way is the system/user time incorrect? Always, or only under high load? what about it is incorrect? My skills are limited but I might take a stab at fixing that. Well, on -STABLE, there can be only one CPU active in the kernel. Thus on a 2-way HTT system, the system thinks there are 4 processors, but there is no way to get 'system' cpu to exceed 25%. So in polling, the 'user frac' and 'kernel frac' are very difficult to understand. --don ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
