Date: Fri, 4 Feb 2011 14:50:34 +0100 From: Joachim Tingvold <joachim@tingvold.com> To: Kenneth D. Merry <ken@freebsd.org> Cc: freebsd-scsi@freebsd.org, Alexander Motin <mav@freebsd.org> Subject: Re: mps0-troubles Message-ID: <FFF5EF18-055C-4E0C-8F9B-03564217F80F@tingvold.com> In-Reply-To: <20110203221056.GA25389@nargothrond.kdm.org> References: <B2CFC8A1-FA1D-4718-99C3-AC3430A905C2@tingvold.com> <41C64262-4300-4187-B5FD-04A5EFB7F87C@tingvold.com> <20110113203750.GA39494@nargothrond.kdm.org> <B22C5568-24D0-4530-B90A-BA6A6CAF111C@tingvold.com> <20110114001758.GA12793@nargothrond.kdm.org> <D24332F3-56AF-484C-9592-1097BF684E37@tingvold.com> <07392102-4584-4690-9188-5202728CC7CA@tingvold.com> <20110120155746.GA22515@nargothrond.kdm.org> <BC40CE83-6116-49CD-8D37-5BC29893449D@tingvold.com> <070C12D5-A54F-4A48-A151-EBA16EF32A13@tingvold.com> <20110203221056.GA25389@nargothrond.kdm.org>
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On Thu, Feb 03, 2011, at 23:10:56PM GMT+01:00, Kenneth D. Merry wrote: > Try running this, and then do 'sysctl hw.mps' and let's see what > your low > water mark is for free chain elements. We'll also want to make sure > your > chain_free value is about equal to MPS_CHAIN_FRAMES when the system is > idle. On my system with a LSI 9201-16i controller, I see: While idle; [jocke@filserver ~]$ sysctl hw.mps.0 hw.mps.0.debug_level: 0 hw.mps.0.allow_multiple_tm_cmds: 0 hw.mps.0.io_cmds_active: 0 hw.mps.0.io_cmds_highwater: 53 hw.mps.0.chain_free: 2048 hw.mps.0.chain_free_lowwater: 2029 hw.mps.0.chain_alloc_fail: 0 After I copied a 22G file from 'storage' to 'zroot'; [jocke@filserver ~]$ sysctl hw.mps.0 hw.mps.0.debug_level: 0 hw.mps.0.allow_multiple_tm_cmds: 0 hw.mps.0.io_cmds_active: 0 hw.mps.0.io_cmds_highwater: 99 hw.mps.0.chain_free: 2048 hw.mps.0.chain_free_lowwater: 2029 hw.mps.0.chain_alloc_fail: 0 After I copied a 22G file from 'zroot' to 'storage'; [jocke@filserver ~]$ sysctl hw.mps.0 hw.mps.0.debug_level: 0 hw.mps.0.allow_multiple_tm_cmds: 0 hw.mps.0.io_cmds_active: 0 hw.mps.0.io_cmds_highwater: 897 hw.mps.0.chain_free: 2048 hw.mps.0.chain_free_lowwater: 2029 hw.mps.0.chain_alloc_fail: 0 -- Joachim
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