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Nick Piggin wrote: > On Saturday 01 March 2008 01:54, Diego Calleja wrote: >> El Fri, 29 Feb 2008 08:38:00 -0500, "Stephen Cuppett" <cuppett@gmail.com> > escribió: >>> loads and 1500% at high loads. When compared with the best performing >>> Linux kernel (2.6.22 or 2.6.24) performance is 15% better. Results are >> There has been some performance problems with sysbench performance in linux >> which made it slower than freebsd, there were some patches to speed things >> up, not sure if they have been merged. > > There definitely were performance problems with threaded malloc/free > in the Linux kernel and glibc. Fixes have been merged in both packages, > and AFAIK the FreeBSD guys tested with those fixes in place. > > I think these were never really run into before in part due to MySQL's > unscalable heap design makes it not scale well on higher numbers of > CPUs anyway, and also made the malloc problems more pronounced (ie. > they added a bit to the contention of the single heap lock, which is > the big killer here). IIRC, going to fine-grained file locking gave them a huge boost in this particular benchmark (and maybe others). As I said on lwn.net Peter Zijlstra posted a patch to break the global file list lock about a year ago [1], but I don't think it was ever merged. Here [2] are some numbers for the patchset. [1] http://lkml.org/lkml/2007/1/28/29 [2] http://lkml.org/lkml/2007/1/28/116 > But it was very nice to be made aware of the problem and be able to > improve it. > > >> Myself I find fun that they look at Linux as the Leader That Must Be >> Surpassed. All the performance highlights of freebsd 7.0 are things that >> linux already did some years ago. > > I don't know very much about FreeBSD nor have verified the results > for myself. But to their credit they seem to have done quite well at > least on the smaller end of the scale. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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