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Date: Mon, 18 Aug 2008 09:48:32 +0800 From: "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> To: Christoph Lameter <cl@...ux-foundation.org> Cc: netdev@...r.kernel.org, lkml <linux-kernel@...r.kernel.org> Subject: Re: tbench regression on each kernel release from 2.6.22 -> 2.6.28 On Mon, 2008-08-11 at 13:36 -0500, Christoph Lameter wrote: > It seems that the network stack becomes slower over time? Here is a list of > tbench results with various kernel versions: > > 2.6.22 3207.77 mb/sec > 2.6.24 3185.66 > 2.6.25 2848.83 > 2.6.26 2706.09 > 2.6.27(rc2) 2571.03 What's the hardware configuration? Is it dual-core? I also track tbench performance with lastest kernels on a couple of quad-core machines, and didn't find such regression while the results did have fluctuation. What's the commandline you is using to start tbench? I start tbench with CPU_NUM*2. BTW, I enabled CONFIG_SLUB since 2.6.22. > > And linux-next is: > > 2.6.28(l-next) 2568.74 > > It shows that there is still have work to be done on linux-next. Too close to > upstream in performance. > > Note the KT event between 2.6.24 and 2.6.25. Why is that? -- 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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