Date: Thu, 20 Nov 1997 16:55:38 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: mrcpu@cdsnet.net (Jaye Mathisen) Cc: hackers@FreeBSD.ORG Subject: Re: Serious performance issue with 2.2.5-RELEASE Message-ID: <199711202155.QAA03288@dyson.iquest.net> In-Reply-To: <Pine.NEB.3.95.971120121353.23652R-100000@mail.cdsnet.net> from Jaye Mathisen at "Nov 20, 97 12:17:36 pm"
next in thread | previous in thread | raw e-mail | index | archive | help
Jaye Mathisen said: > > > I upgraded my web server to 2.2.5 from 2.2.2-stable, dated sometime in > July. > > Big mistake. > > The only update to take place was the make buildworld, make installworld, > no other configuration files were modified, nor any changes to startup > scripts, etc. > > I now get these weird pauses where everything on the machine just freezes > for 30-40 seconds, sometimes longer. NFS is compiled in, but not in use. > > The system was a web server, and was happily serving up several hundred > domains. Now with the upgrade, I'll be lucky to keep them. Not good. > > It's a Super Micro P6, 384MB RAM, 2 SCSI disks off a bus-logic controller. > > Any ideas appreciated. I have built a new kernel from sources supped > 11/7, but it doesn't seem to be any better. > Try this patch. The change in vfs_bio from 2.2.2 to 2.2.5 appears to be incorrect, and subverts part of the functionality of what getnewbuf is supposed to do. (Sorry, the patch might be reversed.) Index: sys/kern/vfs_bio.c =================================================================== RCS file: /local/home/ncvs/src/sys/kern/vfs_bio.c,v retrieving revision 1.104.2.7 retrieving revision 1.104.2.3 diff -C2 -r1.104.2.7 -r1.104.2.3 *** vfs_bio.c 1997/09/01 23:23:08 1.104.2.7 --- vfs_bio.c 1997/02/13 08:17:18 1.104.2.3 *************** *** 889,896 **** /* wait for a free buffer of any kind */ needsbuffer = 1; ! do ! tsleep(&needsbuffer, (PRIBIO + 1) | slpflag, "newbuf", ! slptimeo); ! while (needsbuffer); return (0); } --- 872,877 ---- /* wait for a free buffer of any kind */ needsbuffer = 1; ! tsleep(&needsbuffer, ! (PRIBIO + 1) | slpflag, "newbuf", slptimeo); return (0); } -- John dyson@freebsd.org jdyson@nc.com
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199711202155.QAA03288>