Date: Mon, 19 Dec 2011 20:21:38 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: Ivan Klymenko <fidaj@ukr.net> Cc: freebsd-stable@FreeBSD.org Subject: Re: SCHED_ULE should not be the default Message-ID: <4EEF80B2.1010700@FreeBSD.org> In-Reply-To: <20111219194601.6d0285c7@nonamehost.> References: <4EE1EAFE.3070408@m5p.com> <CAJ-FndDniGH8QoT=kUxOQ%2BzdVhWF0Z0NKLU0PGS-Gt=BK6noWw@mail.gmail.com> <4EE2AE64.9060802@m5p.com> <4EE88343.2050302@m5p.com> <CAFHbX1%2B5PttyZuNnYot8emTn_AWkABdJCvnpo5rcRxVXj0ypJA@mail.gmail.com> <4EE933C6.4020209@zedat.fu-berlin.de> <CAPjTQNEJDE17TLH-mDrG_-_Qa9R5N3mSeXSYYWtqz_DFidzYQw@mail.gmail.com> <4EECD261.2080208@m5p.com> <4EED05EC.8050103@FreeBSD.org> <20111219194601.6d0285c7@nonamehost.>
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on 19/12/2011 19:46 Ivan Klymenko said the following: > В Sat, 17 Dec 2011 23:13:16 +0200 > Andriy Gapon <avg@FreeBSD.org> пишет: > >> on 17/12/2011 19:33 George Mitchell said the following: >>> Summing up for the record, in my original test: >>> 1. It doesn't matter whether X is running or not. >>> 2. The problem is not limited to two or fewer CPUs. (It also >>> happens for me on a six-CPU system.) >>> 3. It doesn't require nCPU + 1 compute-bound processes, just nCPU. >>> >>> With nCPU compute-bound processes running, with SCHED_ULE, any other >>> process that is interactive (which to me means frequently waiting >>> for I/O) gets ABYSMAL performance -- over an order of magnitude >>> worse than it gets with SCHED_4BSD under the same conditions. >> >> I definitely do not see anything like this. >> Specifically: >> - with X >> - with 2 CPUs >> - with nCPU and/or nCPU + 1 compute-bound processes >> - with SCHED_ULE obviously :-) >> I do not get "abysmal" performance for I/O active tasks. >> >> Perhaps there is something specific that you would want me to run and >> measure. >> > > Well, share your experiences - what to do, what would the others were > fine with SCHED_ULE. ;) I didn't have to do anything special, so I am at loss as what to share. It just works (tm) for me. Sorry. -- Andriy Gapon
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