Date: Tue, 8 Jul 2014 15:39:46 -0400 (EDT) From: Rick Macklem <rmacklem@uoguelph.ca> To: Hans Petter Selasky <hps@selasky.org> Cc: pyunyh@gmail.com, freebsd-net@freebsd.org, freebsd-current@FreeBSD.org Subject: Re: [RFC] Allow m_dup() to use JUMBO clusters Message-ID: <1758058976.8852466.1404848386625.JavaMail.root@uoguelph.ca> In-Reply-To: <53BBFE08.1080804@selasky.org>
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Hans Petter Selasky wrote: > > > > Hi, > > > > Would it be better if my patch used the PAGE_SIZE clusters instead > > of > > the 16K ones? Then it should not be affected by memory > > defragmentation. > > Thanks for shedding some light into this area? > > Well, I ran into the threads stuck on "btalloc" when I used PAGE_SIZE clusters mixed with MCLBYTES clusters and from what I could figure, it was a kernel address space fragmentation issue. I would guess that PAGE_SIZE clusters aren't as bad as 16K clusters w.r.t. fragmentation, but I believe that they could still be an issue. (My testing was on a 256Mbyte i386, so I can't say if amd64 systems will have a problem, just that small 32bit arches will.) rick > > --HPS > > > > Hi, > > Updated patch attached. > > --HPS > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to > "freebsd-net-unsubscribe@freebsd.org"
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