Date: Mon, 6 Dec 2010 10:10:33 -0800 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Kostik Belousov <kostikbel@gmail.com> Cc: freebsd-current@freebsd.org Subject: Re: Process accounting/timing has broken recently Message-ID: <20101206181033.GA38739@troutmask.apl.washington.edu> In-Reply-To: <20101206173531.GI2417@deviant.kiev.zoral.com.ua> References: <20101205231829.GA68156@troutmask.apl.washington.edu> <201012060944.03196.jhb@freebsd.org> <20101206163830.GA53157@troutmask.apl.washington.edu> <20101206173531.GI2417@deviant.kiev.zoral.com.ua>
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On Mon, Dec 06, 2010 at 07:35:31PM +0200, Kostik Belousov wrote: > On Mon, Dec 06, 2010 at 08:38:30AM -0800, Steve Kargl wrote: > > John, > > > > Thanks for the comment. It seems this splitting has become > > worse (for some definition of worse) in that previously the > > user time variation was on the order of tenth of a second not > > seconds. In thinking about the issue, I recalled that some > > changes to npx.c were committed 10 days ago. Perhaps, there > > is slightly more context switch overhead in dealing with the > > FPU registers, and this has increased the sys time. > If you can confirm this statement, it would be interesting. Otherwise, > I claim that the changes did not affected the context switch path at > all. The changes were mostly relevant for context(2) family of functions > and debugger access to the FPU register file. I won't be able to test this possibiolity until later tonight (about 9 hours from now). -- Steve
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