Date: Tue, 4 May 1999 14:43:43 +0100 From: Tony Finch <fanf@demon.net> To: current@freebsd.org Subject: Re: NFS Patch #8 for current available - new TCP fixes Message-ID: <E10efU7-0004Iv-00@fanf.noc.demon.net> In-Reply-To: <m2n.s.10cEKr-000C8D@chiark.greenend.org.uk>
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Matthew Dillon <dillon@apollo.backplane.com> wrote: > > (fanfair!) :-) > NFS attempts to realign packet buffers and trods all over the underlying > mbufs. For TCP connections, several RPC's may be present in an mbuf > chain. The realignment of one of them may destroy the others. This does > not occur with UDP because each UDP packet contains only a single rpc. > > Packet buffers may be unaligned for a number of reasons. The main reason > is due to the 14 byte MAC header on the ethernet frame. This causes the > remainder of the packet - the ip payload - to NOT be 4-byte aligned. We're planning to try replacing some Solaris web servers with FreeBSD machines in the near future. The documents are on a read-only NFS filestore connected to the web servers with CDDI. (Updates will stay on a Sun box.) Are we going to have nfs_realign problems if we use TCP in this situation or should we stick with UDP? Tony. -- f.a.n.finch dot@dotat.at fanf@demon.net Arthur: "Oh, that sounds better, have you worked out the controls?" Ford: "No, we just stopped playing with them." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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