Date: Mon, 02 Jan 2012 19:35:41 +0100 From: Florian Smeets <flo@FreeBSD.org> To: Kirk McKusick <mckusick@mckusick.com> Cc: current@FreeBSD.org, Don Lewis <truckman@FreeBSD.org>, Attilio Rao <attilio@FreeBSD.org>, phk@phk.freebsd.dk, kib@FreeBSD.org, seanbru@yahoo-inc.com Subject: Re: dogfooding over in clusteradm land Message-ID: <4F01F8FD.4020901@FreeBSD.org> In-Reply-To: <201112290004.pBT04iQH012044@chez.mckusick.com> References: <201112290004.pBT04iQH012044@chez.mckusick.com>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig446BCA13FCC2AF3331ACDC50 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 29.12.11 01:04, Kirk McKusick wrote: > Rather than changing BKVASIZE, I would try running the cvs2svn > conversion on a 16K/2K filesystem and see if that sorts out the > problem. If it does, it tells us that doubling the main block > size and reducing the number of buffers by half is the problem. > If that is the problem, then we will have to increase the KVM > allocated to the buffer cache. >=20 This does not make a difference. I tried on 32K/4K with/without journal and on 16K/2K all exhibit the same problem. At some point during the cvs2svn conversion the sycer starts to use 100% CPU. The whole process hangs at that point sometimes for hours, from time to time it does continue doing some work, but really really slow. It's usually between revision 210000 and 220000, when the resulting svn file gets bigger than about 11-12Gb. At that point an ls in the target dir hangs in state ufs. I broke into ddb and ran all commands which i thought could be useful. The output is at http://tb.smeets.im/~flo/giant-ape_syncer.txt The machine is still in ddb and i could run any additional commands, the kernel is from Attilio's vmcontention branch, which was MFCed yesterday, and updated after the MFC. The same problem happens on 9.0-RC3. If i run the same test on a zfs filesystem i don't see any problems. Florian --------------enig446BCA13FCC2AF3331ACDC50 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iEYEARECAAYFAk8B+P0ACgkQapo8P8lCvwn0jgCfVz1TSKKrCsB1jFIU24pB8YKt 8qkAn0w3jrw+halyrLXKl2JTLL9U0E/o =pj/5 -----END PGP SIGNATURE----- --------------enig446BCA13FCC2AF3331ACDC50--
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