Date: Mon, 26 Nov 2012 12:39:32 +0100 From: Lukasz Wojcik <lukasz.wojcik@zoho.com> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: current@freebsd.org Subject: Re: syscall cost freebsd vs linux ? Message-ID: <50B354F4.1070706@zoho.com> In-Reply-To: <20121119193202.GA79496@onelab2.iet.unipi.it> References: <20121119193202.GA79496@onelab2.iet.unipi.it>
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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 ? -LW > cheers > luigi > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
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