From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Denys Fedoryshchenko" Subject: Re: e1000 performance issue in 4 simultaneous links Date: Sat, 12 Jan 2008 07:13:06 +0200 Message-ID: <20080112050841.M73900@visp.net.lb> References: <36D9DB17C6DE9E40B059440DB8D95F5204275B04@orsmsx418.amr.corp.intel.com> <20080110.172830.16409182.davem@davemloft.net> <20080111.174109.57502326.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=koi8-r Cc: netdev@vger.kernel.org To: David Miller , benny+usenet@amorsen.dk Return-path: Received: from usermail.globalproof.net ([194.146.153.18]:59375 "EHLO usermail.globalproof.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750783AbYALFNP (ORCPT ); Sat, 12 Jan 2008 00:13:15 -0500 In-Reply-To: <20080111.174109.57502326.davem@davemloft.net> Sender: netdev-owner@vger.kernel.org List-ID: 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 > Date: Fri, 11 Jan 2008 12:09:32 0100 > > > David Miller 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@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Denys Fedoryshchenko Technical Manager Virtual ISP S.A.L.