Date: Thu, 22 Aug 2013 18:58:00 +0400 (MSK) From: Dmitry Morozovsky <marck@rinet.ru> To: "Kenneth D. Merry" <ken@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r254615 - head/sys/dev/mps Message-ID: <alpine.BSF.2.00.1308221856010.10197@woozle.rinet.ru> In-Reply-To: <20130822142107.GA49996@nargothrond.kdm.org> References: <201308212130.r7LLUvO5008991@svn.freebsd.org> <alpine.BSF.2.00.1308221641010.10197@woozle.rinet.ru> <20130822142107.GA49996@nargothrond.kdm.org>
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On Thu, 22 Aug 2013, Kenneth D. Merry wrote: > > > Fix mps(4) driver breakage that came in in change 253550 that > > > manifested itself in out of chain frame conditions. > > > > > > When the driver ran out of chain frames, the request in question > > > would get completed early, and go through mpssas_scsiio_complete(). > > what is real impact of the bug? > > Your system will essentially hang, certainly as far as anything connected > to the controller in question. [snip] > 5. Look for an out of chain frames message on the console. To see how far > you are towards using the chain frames, run 'sysctl dev.mps'. You can see > how many chain frames you have free, and how many requests have failed. > > This change just needs to be merged along with the other changes to avoid > having the regression in stable. Thank you very much for the explanation. We use a couple of servers with mps (and many spindles there), all on stable/9 from this summer, and you commit turns on an alarm light in my head ;) -- Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] [ FreeBSD committer: marck@FreeBSD.org ] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru *** ------------------------------------------------------------------------
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