Date: Wed, 22 Apr 2015 00:39:16 -0400 From: Chris Ross <cross+freebsd@distal.com> To: Gareth Wyn Roberts <g.w.roberts@glyndwr.ac.uk> Cc: Alnis Morics <alnis.morics@gmail.com>, freebsd-stable@freebsd.org Subject: Re: 10.1-STABLE bce: Watchdog timeout occurred Message-ID: <186A4B92-CA84-45DD-8710-307204BD8B7F@distal.com> In-Reply-To: <55365A57.60509@glyndwr.ac.uk> References: <A1E984E1-B551-4CB6-A343-4E73FB58C35E@distal.com> <55361DF6.2080606@gmail.com> <55365A57.60509@glyndwr.ac.uk>
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[-- Attachment #1 --] On Apr 21, 2015, at 10:10 , Gareth Wyn Roberts <g.w.roberts@glyndwr.ac.uk> wrote: > This may be caused by DMA alignment problems. > See https://docs.freebsd.org/cgi/getmsg.cgi?fetch=145859+0+archive/2015/freebsd-stable/20150419.freebsd-stable for a recent thread about the msk driver. The msk maintainer Yonghyeon Pyun has opted for super safe options of 32K alignment! > > It's a long shot, but you could try increasing BCE_DMA_ALIGN and/or BCE_RX_BUF_ALIGN in the include file if_bcereg.h, say up to 4096, to see whether it makes any difference. Well, after making that change, I was able to confirm that the problem doesn't seem to occur. However, in trying to verify the problem on an unmodified kernel, I've rebooted a GENERIC from r281672 without that change, and am also not seeing the problem. :-/ I'm not sure whether the gremlins have "fixed" something, or if I was just too critical in my initial analysis. For now I'll take that change out of my tree and run without it. If I see the flapping again, I'll confirm that it's repeatable, then change the alignments as suggested and see if I see a change. Thanks all... - Chris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQIcBAEBCgAGBQJVNyX0AAoJEPFBDnXvoNg0DZ8P/jeSiDmmHHVdKI31bBrgdONh PF31RNwUoTZ6O+FGhYbIkje3MvhXRzkg1hFLC0A07XhWLYRnI7kY7rpKlx66kLea yK7OHr65ROFifus87+vH5fWGHYnrTnIYDKcZ8c2hZhqy6POdxzj/yfmCNMMkuSGN NIwWqxFfpJIZ5eLoqN3651VfIf2PBG1qc6yGiaRXbDLKYi7uiH5I31BkQ50Tvw+Y rTOuuQPjRUqWLKV0cNc4i6RREQ3AtxnJwIPyzd+3qwrbzKrJBWa+byfT0t7Ykaa2 9W3iUhtMNYBg4hJ17A40i/X3d2CZskY+rs+BsfjGR9lZl7BQmcQISamGimAdbk7n 6azz5qorvlu8290p+RylqG8n15E6xI5sJbUC+lcZAAeT7OCUqOFewFCOTz6plqeh LDCVOvmH3d4QOqNHZJdBZqb6r0WCI7PInrTcMhOZzdrkxSTS8pnpfcjtYpZDbmYl zYWXTQJFDAOMnfL4OXcvG/AeP1WU5Q3U1OC9RYa9UZexSSfVcwGpn539YuRvktgk 5Q8zZopbe+lLP3E1RISBE9yFfBFIvd5pGMhQwt4iQ6Xm/XJG5s/P9wTZjMN4uDz0 yNGZa96WV0VrrYi7R+yMo6Q4ICSsnxzeuVNT1Ma62M86SIbn4VtmPvK4rvqXLTqL /TBkGpj437Dx4/Uy7NSh =Ls1T -----END PGP SIGNATURE-----
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