Date: Thu, 20 Nov 2003 12:58:58 -0500 From: Don Bowman <don@sandvine.com> To: 'Avleen Vig' <lists-freebsd@silverwraith.com>, freebsd-hackers@freebsd.org Subject: RE: Device polling, with SMP? Message-ID: <FE045D4D9F7AED4CBFF1B3B813C85337035E3E73@mail.sandvine.com>
next in thread | raw e-mail | index | archive | help
From: Avleen Vig [mailto:lists-freebsd@silverwraith.com] > > 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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?FE045D4D9F7AED4CBFF1B3B813C85337035E3E73>