Date: Sat, 6 Oct 2007 09:44:29 +0200 From: Marc Fonvieille <blackend@freebsd.org> To: Jeff Roberson <jroberson@chesapeake.net> Cc: current@freebsd.org Subject: Re: ULE/yielding patch for testing. Message-ID: <20071006074429.GB976@gothic.blackend.org> In-Reply-To: <20071002165007.D587@10.0.0.1> References: <20071002165007.D587@10.0.0.1>
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On Tue, Oct 02, 2007 at 04:53:33PM -0700, Jeff Roberson wrote: > Enclosed is a patch that does two things: > > 1) Reduces UP context switch time by over 10% making it faster than 4BSD > on UP. On SMP it's hard to compare since ULE can do as many as 30x as many > switches per second on my 8way system. > > 2) Restores old sched_yield() behavior from 6.x. This was changed in > -current unintentionally I think. > > I'd appreciate any extra testing. The ULE context switch time improvements > required some changes to the frequency that we recalculate priorities. I'm > mostly interested in hearing whether this causes any regression in normal > workloads. > [tested with _ULE] This seems to help a bit the things for me (desktop use during compilations). But 6.X is still faster, i.e, less lags and less jerky mouse movements during port builds. Thanks for spending time improving things, I really appreciate it. -- Marc
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