Date: Wed, 03 May 2000 21:07:54 +0200 From: Gary Jennejohn <garyj@peedub.muc.de> To: Doug Rabson <dfr@nlsystems.com> Cc: Matthew Dillon <dillon@apollo.backplane.com>, freebsd-current@freebsd.org Subject: Re: NFS, rl0 and Alpha Message-ID: <200005031907.VAA14795@peedub.muc.de> In-Reply-To: Your message of "Wed, 03 May 2000 10:40:27 %2B0200." <Pine.BSF.4.21.0005030942040.47945-100000@salmon.nlsystems.com>
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Doug Rabson writes: >On Tue, 2 May 2000, Matthew Dillon wrote: > >> >> :Is anyone else observing kernel panics in the NFS code with Alpha >> :(pc164) and rl0 (the Alpha is running as a client only) ? >> : >> :NFS worked just fine when I had a de0 in the box. After installing an >> :rl0 (I know they suck, but they're so cheap :) I _always_ get an >> :unaligned access panic when I try to access an NFS mounted FS, in any >> :way. >> >> This is almost certainly related to differences in how the >> packet is aligned in memory between de0 and rl0. >> >> If you are getting panics, it is probably at the same >> location every time. If you can get a kernel core dump >> and backtrace I'll bet we can find and fix this problem >> quickly. > >Bill put workarounds for the alpha's alignment restrictions into some of >his drivers but it seems that he missed out rl. Basically the part of the >packet which includes headers needs to have the start of the ip header >aligned to a 4-byte boundary. Since the preceding ethernet header is not >padded to 4 bytes, this often means copying the first part of the packet >to another mbuf. > Thanks, but there is code in rl_rxeof() to align to a 32 bit boundary. If that weren't the case than I would expect the Alpha to panic with other IP applications, not just NFS. I don't know, NFS must be doing something weird. --- Gary Jennejohn / garyj@muc.de gj@freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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