Date: Sat, 06 Oct 2007 14:58:23 +0200 From: Kris Kennaway <kris@FreeBSD.org> To: Benjamin Close <Benjamin.Close@clearchain.com> Cc: Jeff Roberson <jroberson@chesapeake.net>, current@freebsd.org Subject: Re: ULE/yielding patch for testing. Message-ID: <4707866F.7030605@FreeBSD.org> In-Reply-To: <47077951.5030906@clearchain.com> References: <20071002165007.D587@10.0.0.1> <20071006074429.GB976@gothic.blackend.org> <20071006102113.GC976@gothic.blackend.org> <47077951.5030906@clearchain.com>
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Benjamin Close wrote: > Marc Fonvieille wrote: >> On Sat, Oct 06, 2007 at 09:44:29AM +0200, Marc Fonvieille wrote: >> >>> 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. >>> >>> >> >> After more testing, the lag problem is caused by the use of firefox. >> Once I try to open a heavy webpage, both firefox and Xorg become slow, >> the rest is fine. By the "rest" I mean: audacious playing mp3s, wget and >> ncftp downloading huge (100MB) files, compiling wine and aMule running. >> > I find the lag occuring with the 4BSD scheduler as well. dailytech.com > is a particularly good site at lagging the system (though a great website). > Perhaps this isn't scheduler related? I assume you checked whether you are touching swap. Kris
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