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Open Source and information security mailing list archives
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Date: Fri, 29 Aug 2008 08:43:18 -0700 From: Stephen Hemminger <shemminger@...tta.com> To: Denys Fedoryshchenko <denys@...p.net.lb> Cc: Eric Dumazet <dada1@...mosbay.com>, Andi Kleen <andi@...stfloor.org>, Joe Malicki <jmalicki@...acarta.com>, David Miller <davem@...emloft.net>, johnpol@....mipt.ru, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, juhlenko@...mai.com, sammy@...my.net Subject: Re: loaded router, excessive getnstimeofday in oprofile On Thu, 28 Aug 2008 22:55:29 +0300 Denys Fedoryshchenko <denys@...p.net.lb> wrote: > On Thursday 28 August 2008, Eric Dumazet wrote: > > OK, please try oprofile with call graph analysis. > I did already. Even because most of programs (except ripd/zebra) can be > killed, and i kill them, it doesn't change almost anything. > > it seems heavy things causing instability: > > 1)HTB (resolution can be lowered to improve performance, i will try Jarek > patch soon) If you are doing HTB it also calls clock to get timing information. Each packet dequeue in htb calls psched_get_time() and that becomes another call nano-second real time clock. If your embedded processor has really expensive clock, you probably just want to provide an alternative cheaper time source with less resolution. -- 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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