Date: Thu, 25 May 2006 08:40:18 GMT From: Kris Kennaway <kris@obsecurity.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/97686: massive NFS server performance break under "options QUOTA" Message-ID: <200605250840.k4P8eIgw031094@freefall.freebsd.org>
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The following reply was made to PR kern/97686; it has been noted by GNATS. From: Kris Kennaway <kris@obsecurity.org> To: "Ralf S. Engelschall" <rse@FreeBSD.org> Cc: FreeBSD-gnats-submit@FreeBSD.org Subject: Re: kern/97686: massive NFS server performance break under "options QUOTA" Date: Thu, 25 May 2006 04:36:29 -0400 --+HP7ph2BbKc20aGI Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, May 23, 2006 at 01:58:20PM +0200, Ralf S. Engelschall wrote: > After an upgrade we experienced massive serious NFS server problems > on a NFS server under FreeBSD 6.1-STABLE (as of 2006-05-23). It > still worked fine (exactly same kernel configuration) under FreeBSD > 5.4-STABLE (as of about December 2005). > =20 > The effect is that the machine becomes totally unusable (nearly a > system freeze) after about 10 minutes of just moderate NFS traffic > of a single NFS client. We figured out that once the "options QUOTA" > was removed from the kernel configuration the machine performance > was 100% ok and we do not experience any performance breaks again. > Even disabling SMP or deconfiguring all Netgraph configurations (for > interface bundling and Netflow statistics) caused no effect. Only the > "options QUOTA" caused the problem and its removal finally fixed the > problem. >=20 > There seems to be a strange interaction between NFS and UFS Quotas... FYI, this might be due to the changes to vfs_lookup.c that I merged just before the release (originally by Jeff). There are other reports of this problem on -stable@; I'm not clear if all of them involve quotas though. As a temporary workaround you can revert that commit, although that's not a solution since that commit fixed other problems. Hopefully a solution will be found in the next week. Kris --+HP7ph2BbKc20aGI Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFEdWyNWry0BWjoQKURAjH4AJ9vRRRlkfXdvs/4q/1Y0wxTI/EypACggXxX Fz3xHDV3oG54A3s8ybttRZ0= =0lnG -----END PGP SIGNATURE----- --+HP7ph2BbKc20aGI--
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