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Date: Mon, 17 Nov 2008 11:39:36 -0800 (PST) From: David Miller <davem@...emloft.net> To: mingo@...e.hu Cc: torvalds@...ux-foundation.org, dada1@...mosbay.com, rjw@...k.pl, linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org, cl@...ux-foundation.org, efault@....de, a.p.zijlstra@...llo.nl, shemminger@...tta.com Subject: Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28 From: Ingo Molnar <mingo@...e.hu> Date: Mon, 17 Nov 2008 19:49:51 +0100 > > * Ingo Molnar <mingo@...e.hu> wrote: > > 4> The place for the sock_rfree() hit looks a bit weird, and i'll > > investigate it now a bit more to place the real overhead point > > properly. (i already mapped the test-bit overhead: that comes from > > napi_disable_pending()) > > ok, here's a new set of profiles. (again for tbench 64-thread on a > 16-way box, with v2.6.28-rc5-19-ge14c8bf and with the kernel config i > posted before.) Again, do a non-NMI profile and the top (at least for me) looks like this: samples % app name symbol name 473 6.3928 vmlinux finish_task_switch 349 4.7169 vmlinux tcp_v4_rcv 327 4.4195 vmlinux U3copy_from_user 322 4.3519 vmlinux tl0_linux32 178 2.4057 vmlinux tcp_ack 170 2.2976 vmlinux tcp_sendmsg 167 2.2571 vmlinux U3copy_to_user That tcp_v4_rcv() hit is %98 on the wake_up() call it does. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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