Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268678AbUIQKsF (ORCPT ); Fri, 17 Sep 2004 06:48:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268681AbUIQKqI (ORCPT ); Fri, 17 Sep 2004 06:46:08 -0400 Received: from 168.imtp.Ilyichevsk.Odessa.UA ([195.66.192.168]:50699 "HELO port.imtp.ilyichevsk.odessa.ua") by vger.kernel.org with SMTP id S268678AbUIQKoy (ORCPT ); Fri, 17 Sep 2004 06:44:54 -0400 From: Denis Vlasenko To: William Lee Irwin III Subject: Re: top hogs CPU in 2.6: kallsyms_lookup is very slow Date: Fri, 17 Sep 2004 11:57:24 +0300 User-Agent: KMail/1.5.4 Cc: linux-kernel@vger.kernel.org References: <200409161428.27425.vda@port.imtp.ilyichevsk.odessa.ua> <200409161457.08544.vda@port.imtp.ilyichevsk.odessa.ua> <20040916121747.GQ9106@holomorphy.com> In-Reply-To: <20040916121747.GQ9106@holomorphy.com> MIME-Version: 1.0 Content-Type: Multipart/Mixed; boundary="Boundary-00=_0bqSBLyeljEd0xI" Message-Id: <200409171157.24943.vda@port.imtp.ilyichevsk.odessa.ua> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 15923 Lines: 257 --Boundary-00=_0bqSBLyeljEd0xI Content-Type: text/plain; charset="koi8-r" Content-Transfer-Encoding: 7bit Content-Disposition: inline On Thursday 16 September 2004 15:17, William Lee Irwin III wrote: > At some point in the past, I wrote: > >> As for all syscalls/etc. being slower by 50%-100%, I suggest toning > > On Thu, Sep 16, 2004 at 02:57:08PM +0300, Denis Vlasenko wrote: > > s/all/many/: > > uname <0.000142> ? ? ? ? ? ? ? uname <0.000217> 25% slower > > brk <0.000176> ? ? ? ? ? ? ? ? brk <0.000174> no change > > open <0.000218> ? ? ? ? ? ? ? ?open <0.000335> 33% slower > > fstat64 <0.000104> ? ? ? ? ? ? fstat64 <0.000191> 90% slower > > or maybe strace simply isn't very accurate and adds signinficant > > noise to the measured delta? > > Could you try to estimate the resolution of whatever timer strace uses? > > At some point in the past, I wrote: > >> down HZ (we desperately need to go tickless) and seeing if it persists. > >> Also please check that time isn't twice as fast as it should be in 2.6. > > On Thu, Sep 16, 2004 at 02:57:08PM +0300, Denis Vlasenko wrote: > > I recompiled 2.6 with HZ=100. It's not it. > > Time is running normally too. > > Did the kallsyms patches reduce the cpu overhead from get_wchan()? I take > this to mean reducing HZ to 100 did not alleviate the syscall problems? > How do microbenchmarks fare, e.g. lmbench? Not a lmbench, but: #include int main() { int fd; int i=100000; while(i--) { fd = open("/etc/ld.so.cache", O_RDONLY); close(fd); } return 0; } 2.4: # time ./openclose real 0m7.455s user 0m0.300s sys 0m7.150s 2.6: # time ./openclose real 0m8.170s user 0m0.370s sys 0m7.800s 2.6 is at HZ=100 here. /etc is on ramfs. configs are in attached tarball. -- vda --Boundary-00=_0bqSBLyeljEd0xI Content-Type: application/x-tbz; name="c.tar.bz2" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="c.tar.bz2" QlpoOTFBWSZTWeYxeN0AVoF/xNiQAEB45//yP///8f////AAEAAAgAhgNT94AAAABd99z54QAp51 586tffDQE221HQ1QCi4ADXoFIAABBoAUADToKBhAAAoANANFAAdAAaABQAGgAZANFLsGgUOgBqgA Pia9sbrfXor1p8h99p8JU0AE0ABAJqJmoNEGgaaDQ0A0AAlTIaJiTEyCZSbRqG/VR6mnqekNNAyD T1GIAAJTUTRTap7aqfqn6aTZU/VH6jKPaptTTRppp6ENDQ0Mg9QAJNFRIyhpoU0Y0gDTQGgADQAA PUGgJJTKehJ5CntSeMo02pomj0AGgBojRkxDJhAkRAgCAgIFG1GlNqD0jQNDQAAAep/2X8/9Z27n tnZWSCLoQVYgK+kTmHsVgdfh+++PFn4hliBO0D/h/PzlQUrFiyjXawFmEK/JQKqOskrBQRiKihRh 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