Date: Fri, 26 Oct 2001 10:53:34 +0100 From: David Malone <dwmalone@maths.tcd.ie> To: Alfred Perlstein <bright@mu.org> Cc: Luigi Rizzo <rizzo@aciri.org>, net@FreeBSD.ORG Subject: Re: performance issues with M_PREPEND on clusters Message-ID: <20011026105334.A14635@walton.maths.tcd.ie> In-Reply-To: <20011023140034.M15052@elvis.mu.org>; from bright@mu.org on Tue, Oct 23, 2001 at 02:00:34PM -0500 References: <20011023110307.A34494@iguana.aciri.org> <20011023132813.I15052@elvis.mu.org> <20011023114650.C34494@iguana.aciri.org> <20011023140034.M15052@elvis.mu.org>
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On Tue, Oct 23, 2001 at 02:00:34PM -0500, Alfred Perlstein wrote: > Yes, you're right, I was mistaken in my paranioa, however you're > missing the fact that one may want to allocate an EXT buf and still > have it writeable. This is the function of M_RDONLY and M_WRITABLE framework which we put in place in -current about a year ago. I think we set things up so that sendfilebufs are not writable and so that custom external storage for jumbo ethernet frames are writeable. The changes were a bit big to port back to -stable. They involved moving external storage reference counts into the generic mbuf system. David. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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