On Wed, Apr 16, 2008 at 01:36:36AM +0300, Anton Titov wrote: > On Tue, 2008-04-15 at 13:40 -0700, Kok, Auke wrote: > > Willy Tarreau wrote: > > 1) turn the in-kernel IRQBALANCE option off ! > Actually it may be already removed. I remember it being under "Processor > type and features" and I currently cannot find it there for x86_64 > > > 2) use either the userspace `irqbalance` daemon or > > 3) set smp_affinity manually > > I tried echoing 3 (assuming that CPU0 and CPU1 will share their cache, > as advised in other mails) into smp_affinity of all ethX interrupts and > no positive result was observed. But have you disabled irqbalance before doing this ? (you must reboot and pass "noirqbalance" on the command line for this). Also, if you are running on quad-core intel CPUs, I'm told that they're simply two standard dual-core CPUs in the same case, so there is no shared cache between any core. You should try to assign all irqs to CPU0 for a test. It *must* make a difference, in either direction. > I will try disabling NAPI and limiting e1000 interrupts tomorrow. I found the parameter name I was speaking about : InterruptThrottleRate. Beware it's an array with one entry per NIC, so you have to set as many values as you have NICs. I have always observed huge performance boosts when using the tunables the driver provides. Willy -- To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
