Date: Sun, 31 Jul 2011 17:21:18 -0400 (EDT) From: Rick Macklem <rmacklem@uoguelph.ca> To: Andriy Gapon <avg@FreeBSD.org> Cc: FreeBSD-Current <freebsd-current@FreeBSD.org> Subject: Re: Heavy I/O blocks FreeBSD box for several seconds Message-ID: <2090844362.1227850.1312147278961.JavaMail.root@erie.cs.uoguelph.ca> In-Reply-To: <4E35ACDD.90303@FreeBSD.org>
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Abdriy Gapon wrote: > on 31/07/2011 22:03 Rick Macklem said the following: > > Ok, so if the scheduler spin lock is being held too long, what could > > cause this, if it isn't a scheduler bug? > > > > I can't think of how NFS would affect this beyond causing a heavy > > I/O > > load, but if there is some way it does, I suppose I need to know > > what > > that is? > > I think I've already referred to the thread on stable@. > This is currently being investigated. > > P.S. > Just a pure illustration you can grep for thread_lock to see where > else outside > schedulers the sched locks are taken. > -- Yes, I see what you mean (ie. it's all over the place). Sorry about the noise, rick
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