David Xu wrote: > Poul-Henning Kamp wrote: > >> In message <4361F057.4030904_at_pp.nic.fi>, Pertti Kosunen writes: >> >> >>> Does polling affect to this test? >> >> >> >> Not apart from the CPU overhead. >> >> sysctl kern.timecounter.hardware >> >> is much more important. >> >> and all the reports here which fail to include it are mostly >> useless. >> >> > I suspect because our time() function in libc uses gettimeofday, > this further causes lots of gettimeofday syscall. > > Now, I can confirm mysqld calls time() function lots of time, I have changed time() to call clock_gettime, now there is few of gettimeofday in ktrace result, but fully filled by clock_gettime. Can we optimize time()? because it only returns second. may we just create a syscall to return time_second variable in kernel, this sounds crazy though.Received on Fri Oct 28 2005 - 08:30:24 UTC
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