On Aug 22, 2013, at 7:58 AM, Dmitry Morozovsky <ma...@rinet.ru> wrote:
> 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 ;) I'll confirm with my netflix hat on that this isn't a problem in 9. Scott _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
