On 26 November 2012 15:39, Lukasz Wojcik <lukasz.wojcik_at_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, pluknetReceived on Mon Nov 26 2012 - 23:02:46 UTC
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