Date: Tue, 27 Oct 2009 08:04:45 +1100 From: Andrew Reilly <areilly@bigpond.net.au> To: "b. f." <bf1783@googlemail.com> Cc: freebsd-stable@FreeBSD.org Subject: Re: Some questions about da0 on USB2 (recent bad behaviour) Message-ID: <20091026210445.GA66088@duncan.reilly.home> In-Reply-To: <d873d5be0910241207o2ae4be8ah6db9a7996581ec69@mail.gmail.com> References: <d873d5be0910241207o2ae4be8ah6db9a7996581ec69@mail.gmail.com>
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On Sat, Oct 24, 2009 at 07:07:00PM +0000, b. f. wrote: > >That is: it seems to work fine for some fraction of a minute > >(doesn't seem to be longer than a minute, anyway), and then > >stops completely for several minutes (processes reading or > >writing sit in "D" state in ps) and then starts again, after > >logging "Request completed with CAM_REQ_CMP_ERR\nRetrying > >Command". > > In the past week or so, Alexander Motin (mav@FreeBSD.org) and Andrew > Thompson (thompsa@FreeBSD.org) have made a number of related changes > to cam and usb in the P4 repository, and in 9-CURRENT. Some of these > may address your problem. I'm not sure when they will be back-ported > to 8.X. You may wish to try out the latest version of -CURRENT, to > see if it solves your problem(s); or to contact them. I've done this, and it seems to have worked. It seems possible that the bulk throughput (measured by systat while doing a cat /backup/bigfile >/dev/null) might even have increased a bit, but maybe not. The big improvement is that the transfer isn't pausing any more. No more CAM_REQ_CMP_ERR messages. Thanks b. f. for the suggestion, and thanks Alexander and Andrew for the fixes! I haven't run -current for, probably, ten years, and the occasional messages about lock-order-reversals worry me a bit, but don't seem to be doing any harm. Should I report them? In a PR? Please count this message as a vote for MFC'ing those cam and usb changes to 8-STABLE. Cheers, -- Andrew
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