Messages in this thread | | | Date | Thu, 30 Mar 2006 13:07:21 +0200 | From | Willy Tarreau <> | Subject | Re: [rfc][patch] improved interactive starvation patch against 2.6.16 |
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Hi Mike,
On Thu, Mar 30, 2006 at 12:19:57PM +0200, Mike Galbraith wrote: > Greetings, > > The patch below alone makes virgin 2.6.16 usable in the busy apache > server scenario, and should help quite a bit with other situations as > well. > > The original version helps a lot, but not enough, and the latency of > being awakened in the expired array can be needlessly painful. Ergo, > speed up the array switch, and instead of unconditionally plunking all > awakening tasks (including rt tasks, oops) into the expired array, check > to see if the task has run since the last array switch first. This > leaves a theoretical hole for a stream of one-time waking tasks to > starve the expired array indefinitely, but it deals with the real > problem pretty nicely I think.
Interesting.
> For the one or two folks on the planet testing my anti-starvation > patches, I've attached an incremental to my 2.6.16 test release.
Thanks, I'll test this ASAP, though I'm clearly busy right now.
Cheers, Willy
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