Date: Mon, 11 Mar 2013 13:58:23 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-hardware@freebsd.org Subject: Re: Strange performance problems with I/O subsystem Message-ID: <khkkdc$f7m$1@ger.gmane.org> In-Reply-To: <1256991362726424@web16d.yandex.ru> References: <261461361939965@web1e.yandex.ru> <kh594r$v3g$2@ger.gmane.org> <1256991362726424@web16d.yandex.ru>
index | next in thread | previous in thread | raw e-mail
[-- Attachment #1 --] On 08/03/2013 08:07, Гуляев Гоша wrote: > 05.03.2013, 23:14, "Ivan Voras" <ivoras@freebsd.org>: > > On 27/02/2013 05:39, Гуляев Гоша wrote: > > And when I have some intensive I/O tasks (csup -g /root/mysupfile, > or > portsnap fetch update, or rm -rf /usr/obj, when system working > sequentialy with many files in general) my system begins > periodically > freezes. If I see gstat it shows me 100% I\O on disk. > > It usually means some kind of incompatibility of your disk drive and > the > system, its controller or its driver. > Sometimes it could me that the disk is broken. > > Ivan, thank for answer! I think there is no any hardware problem, > because as I say before, in other OS'es all works fine, without > performance problems. How I can diagnose problem deeply, and maybe give > some useful information for resolving that issue? It is hard to give good general advice in this case. You could maybe see if there are any error messages in your /var/log/messages file. You could also monitor the wchan of the hung process and verify if it's stuck in the "wdrain" state (in "top"). Maybe you could see if there is a problem with interrupts on the machine (either by using "systat -vm" or "vmstat -i"). You could run "iostat -x" and see if the %busy column is 100% while there are many queued requests. If you install smartmontools, you can run a couple of tests just in case (try smartctl /dev/ada0 and smartctl -t long /dev/ada0). ... but if the problem is an incompatibility with the driver, all this will probably not help you much. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlE91O8ACgkQ/QjVBj3/HSywBQCdGOBKIOMYwjJbwFBTmUC2xeBY aWYAnRZHZZq4eRXdMCJfjqB31A0GwDHc =vO61 -----END PGP SIGNATURE-----help
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?khkkdc$f7m$1>