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Date: Thu, 21 Mar 2013 23:40:09 -0400 From: Rik van Riel <riel@...riel.com> To: Linus Torvalds <torvalds@...ux-foundation.org> CC: Davidlohr Bueso <davidlohr.bueso@...com>, Andrew Morton <akpm@...ux-foundation.org>, hhuang@...hat.com, "Low, Jason" <jason.low2@...com>, Michel Lespinasse <walken@...gle.com>, Larry Woodman <lwoodman@...hat.com>, "Vinod, Chegu" <chegu_vinod@...com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: ipc,sem: sysv semaphore scalability On 03/21/2013 09:23 PM, Linus Torvalds wrote: > On Thu, Mar 21, 2013 at 6:12 PM, Davidlohr Bueso <davidlohr.bueso@...com> wrote: >> >> ipc lock contention: >> 100 users: 8,74% (vanilla) 3.17% (v3 patchset) >> 400 users: 21,86% (vanilla) 5.23% (v3 patchset) >> 800 users 84,35% (vanilla) 7.39% (v3 patchset) > > Ok, I'd call that pretty much "solved". Sure, it's still visible, but > for being a benchmark that apparently does little else than pound on > those sysv semaphores, I think we can consider it pretty much fine. > I'm going to assume that anybody who actually then does any real work > (ie a database) is never going to see even close to this bad > contention. > > Good job, Rik. I'm assuming we'll be merging this during the 3.10 > merge window, and hopefully the merge conflicts will be sorted out > too. Rik, Peter, can you look at each others patches and see if you > can get that sorted out for Andrew? Will do. I will rebase this series on top of what is in linux-next. -- All rights reversed. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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