Date: Tue, 27 Nov 2012 03:02:45 +0300 From: Sergey Kandaurov <pluknet@gmail.com> To: Lukasz Wojcik <lukasz.wojcik@zoho.com> Cc: Luigi Rizzo <rizzo@iet.unipi.it>, current@freebsd.org Subject: Re: syscall cost freebsd vs linux ? Message-ID: <CAE-mSO%2BCSoUVb4QU93K6tVva%2BbcGtDj5ouJQhWiQsFHA-qCY4A@mail.gmail.com> In-Reply-To: <50B354F4.1070706@zoho.com> References: <20121119193202.GA79496@onelab2.iet.unipi.it> <50B354F4.1070706@zoho.com>
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On 26 November 2012 15:39, Lukasz Wojcik <lukasz.wojcik@zoho.com> wrote: > On 11/19/12 20:32, Luigi Rizzo wrote: >> >> today i was comparing the performance of some netmap-related code >> on FreeBSD and Linux (RELENG_9 vs 3.2) and i was surprised to see that >> our system calls are significantly slower. >> On comparable hardware (i7-2600k vs E5-1650) the syscall >> getppid() takes about 95ns on FreeBSD and 38ns on linux. >> >> (i make sure not to use gettimeofday(), which in linux is through vdso, >> and getpid(), which is cached by glibc). >> >> Any idea on why there is this difference and whether/how >> we can reduce it ? >> > > I'm curious about how did you measure that ? Could you write some more about > your methodology ? There is a nice tool at /usr/src/tools/tools/syscall_timing -- wbr, pluknet
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