Date: Fri, 23 Aug 2013 10:00:59 -0700 From: Scott Long <scott4long@yahoo.com> To: Dmitry Morozovsky <marck@rinet.ru> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, "Kenneth D. Merry" <ken@freebsd.org> Subject: Re: svn commit: r254615 - head/sys/dev/mps Message-ID: <74108713-986A-4CBD-A441-395C7B54456A@yahoo.com> In-Reply-To: <alpine.BSF.2.00.1308221856010.10197@woozle.rinet.ru> References: <201308212130.r7LLUvO5008991@svn.freebsd.org> <alpine.BSF.2.00.1308221641010.10197@woozle.rinet.ru> <20130822142107.GA49996@nargothrond.kdm.org> <alpine.BSF.2.00.1308221856010.10197@woozle.rinet.ru>
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On Aug 22, 2013, at 7:58 AM, Dmitry Morozovsky <marck@rinet.ru> wrote: > On Thu, 22 Aug 2013, Kenneth D. Merry wrote: >=20 >>>> Fix mps(4) driver breakage that came in in change 253550 that >>>> manifested itself in out of chain frame conditions. >>>>=20 >>>> When the driver ran out of chain frames, the request in question >>>> would get completed early, and go through = mpssas_scsiio_complete(). >=20 >>> what is real impact of the bug? >>=20 >> Your system will essentially hang, certainly as far as anything = connected >> to the controller in question. >=20 > [snip] >=20 >> 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. >>=20 >> This change just needs to be merged along with the other changes to = avoid >> having the regression in stable. >=20 > Thank you very much for the explanation. We use a couple of servers = with mps=20 > (and many spindles there), all on stable/9 from this summer, and you = commit=20 > turns on an alarm light in my head ;) I'll confirm with my netflix hat on that this isn't a problem in 9. Scott
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