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Date: Sat, 12 Jan 2008 07:13:06 +0200 From: "Denys Fedoryshchenko" <denys@...p.net.lb> To: David Miller <davem@...emloft.net>, benny+usenet@...rsen.dk Cc: netdev@...r.kernel.org Subject: Re: e1000 performance issue in 4 simultaneous links Sorry. that i interfere in this subject. Do you recommend CONFIG_IRQBALANCE to be enabled? If it is enabled - irq's not jumping nonstop over processors. softirqd changing this behavior. If it is disabled, irq's distributed over each processor, and in loaded systems it seems harmful. I work a little yesterday with server with CONFIG_IRQBALANCE=no, 160kpps load. It was packetloss-ing, till i set smp_affinity. Maybe it is useful to put more info in Kconfig, since it is very important for performance option. On Fri, 11 Jan 2008 17:41:09 -0800 (PST), David Miller wrote > From: Benny Amorsen <benny usenet@...rsen.dk> > Date: Fri, 11 Jan 2008 12:09:32 0100 > > > David Miller <davem@...emloft.net> writes: > > > > > No IRQ balancing should be done at all for networking device > > > interrupts, with zero exceptions. It destroys performance. > > > > Does irqbalanced need to be taught about this? > > The userland one already does. > > It's only the in-kernel IRQ load balancing for these (presumably > powerpc) platforms that is broken. > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Denys Fedoryshchenko Technical Manager Virtual ISP S.A.L. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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