Date: Mon, 29 Aug 2005 11:15:33 -0700 (PDT) From: Don Lewis <truckman@FreeBSD.org> To: kabaev@gmail.com, doconnor@gsoft.com.au Cc: freebsd-current@FreeBSD.org Subject: Re: Odd performance problem (hitching) Message-ID: <200508291815.j7TIFXw1013092@gw.catspoiler.org> In-Reply-To: <20050825202033.579b3e9c@kan.dnsalias.net>
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On 25 Aug, Alexander Kabaev wrote: > On Fri, 26 Aug 2005 09:13:53 +0930 > "Daniel O'Connor" <doconnor@gsoft.com.au> wrote: > >> I updated to -current recently (from an earlier -current) and haven't >> changed any kernel options, but now the systems seems to 'hitch' >> fairly frequently. ie the system will run fine then stall for half a >> second or so, then continue as normal. It is most noticeable when >> playing music. >> >> If I turn powerd off and run the CPU at full speed it works better, >> but it still happens on occasion so I am guessing powerd isn't the >> problem per se, but just makes it worse. >> >> I am not 100% sure when the problem started but if I get time I will >> try a binary search to find out.. It believe around 6.0-BETA1 (30 >> July) was OK, but I don't have any more data points yet. >> >> I've attached my dmesg and kernel config file if it helps. >> >> -- >> Daniel O'Connor software and network engineer >> for Genesis Software - http://www.gsoft.com.au >> "The nice thing about standards is that there >> are so many of them to choose from." >> -- Andrew Tanenbaum >> GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C > > > Can you try backing out this commit? > > http://cvsweb.FreeBSD.org/src/sys/kern/vfs_subr.c.diff?r1=1.641&r2=1.642 Any more info on this problem? I just got my MFC reminder for this change and I don't want to request permission for the MFC until I know for sure that it (or 1.636, which is also has a pending MFC) isn't the cause of the problem. What else is happening on machine when the symptoms occur? I would only expect vfs_subr.c 1.636 and 1.642 to affect the behaviour if there was a lot of file system activity that put pressure on the system to free up vnodes.
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