Date: Wed, 27 Feb 2002 12:19:03 -0800 From: Alfred Perlstein <bright@mu.org> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Julian Elischer <julian@elischer.org>, Jeff Roberson <jroberson@chesapeake.net>, arch@FreeBSD.ORG Subject: Re: Slab allocator Message-ID: <20020227201903.GS80761@elvis.mu.org> In-Reply-To: <200202271955.g1RJtAj30178@apollo.backplane.com> References: <200202271926.g1RJQCm29905@apollo.backplane.com> <Pine.BSF.4.21.0202271128580.97278-100000@InterJet.elischer.org> <20020227194256.GR80761@elvis.mu.org> <200202271955.g1RJtAj30178@apollo.backplane.com>
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* Matthew Dillon <dillon@apollo.backplane.com> [020227 11:55] wrote: > > : > :* Julian Elischer <julian@elischer.org> [020227 11:40] wrote: > :> > :> > :> On Wed, 27 Feb 2002, Matthew Dillon wrote: > :> > :> > > :> > :PS Sorry for the long winded email. :-) > :> > > :> > Well, one thing I've noticed right off the bat is that the code > :> > is trying to take advantage of per-cpu queues but is still > :> > having to obtain a per-cpu mutex to lock the per-cpu queue. > :> > :> I was wondering abuot that myself :-) > : > :It's basically the pre-emption stuff you guys are wondering about > :along with the possiblity of free'ing back to another cpu's > :cache that may be an issue. > : > :Jeff, are you fee'ing memory back to the cache it was initially > :allocated from or not? > : > :-Alfred > > I don't know what Jeff is doing there but I do seem to recall a > paper from somewhere that indicated it was more efficient to free memory > to the current cpu's per-cpu cache rather then back to the original > cpu's cache because the current cpu's hardware L1/L2 cache likely already > has mastership of the memory. I think Linux does things this way. Last I checked linux does not. the stuff we both are talking about (free'ing back to original cache) is detailed in the 'Horde' memory allocator which is hard to find online. -- -Alfred Perlstein [alfred@freebsd.org] 'Instead of asking why a piece of software is using "1970s technology," start asking why software is ignoring 30 years of accumulated wisdom.' Tax deductible donations for FreeBSD: http://www.freebsdfoundation.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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