Date: Fri, 14 Jan 2011 01:38:27 +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: <D24332F3-56AF-484C-9592-1097BF684E37@tingvold.com> In-Reply-To: <20110114001758.GA12793@nargothrond.kdm.org> References: <mailpost.1294832739.2809102.16331.mailing.freebsd.scsi@FreeBSD.cs.nctu.edu.tw> <4D2DAA45.30602@FreeBSD.org> <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>
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On Fri, Jan 14, 2011, at 01:17:58AM GMT+01:00, Kenneth D. Merry wrote: >> This won't "conflict" with what you've written here[1]? The 9211-8i >> controller I have, use the SAS2008-chip. > > No, this affects the number of buffers available for scatter/gather > entries. Most commands will just have one physical memory buffer > attached, > since system buffer memory is physically contiguous. > > It doesn't affect the number of commands the driver sends down to the > chip. I see. The strange thing is that I copied around 7-8TB at around 105MB/s (via samba) to 'storage', without ever having this issue. There has been no hardware-change of any kind since this was done. >> Would it be possible that low amounts of free memory (<100MB, the >> system has a total of 4GB) could cause this? (since I'm using ZFS, >> which relies heavily on memory). > > I don't think so. If anything, I think that this is likely > triggered by > a large number of outstanding commands, or perhaps a leak > somewhere. If > it's the former, hopefully this will fix it. If it's the latter, > you'll > eventually run into the problem again. Okay. I've changed the value. I'll keep you posted. -- Joachim
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