Date: Tue, 8 Apr 2008 09:42:15 +0200 From: =?ISO-8859-1?Q?Johan_Str=F6m?= <johan@headweb.com> To: d@delphij.net Cc: freebsd-fs@freebsd.org, freebsd-stable@freebsd.org Subject: Re: ZFS deadlock Message-ID: <D136B1EB-08C7-4307-9AE1-6306C30507AE@headweb.com> In-Reply-To: <47FB20B5.8050205@delphij.net> References: <0B67CBBD-11CB-44C2-807D-5F00654CDD35@headweb.com> <47FB20B5.8050205@delphij.net>
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On Apr 8, 2008, at 9:37 AM, LI Xin wrote: > Johan Ström wrote: >> Hello >> A box of mine running RELENG_7_0 and ZFS over a couple of disks (6 >> disks, 3 mirrors) seems to have gotten stuck. From Ctrl-T: >> load: 0.50 cmd: zsh 40188 >> [zfs:&buf_hash_table.ht_locks[i].ht_lock] 0.02u 0.04s 0% 3404k >> load: 0.43 cmd: zsh 40188 >> [zfs:&buf_hash_table.ht_locks[i].ht_lock] 0.02u 0.04s 0% 3404k >> load: 0.10 cmd: zsh 40188 >> [zfs:&buf_hash_table.ht_locks[i].ht_lock] 0.02u 0.04s 0% 3404k >> load: 0.10 cmd: zsh 40188 >> [zfs:&buf_hash_table.ht_locks[i].ht_lock] 0.02u 0.04s 0% 3404k >> load: 0.11 cmd: zsh 40188 >> [zfs:&buf_hash_table.ht_locks[i].ht_lock] 0.02u 0.04s 0% 3404k >> Worked for a while then that stopped working too (was over ssh). >> When trying a local login i only got >> load: 0.09 cmd: login 1611 [zfs] 0.00u 0.00s 0% 208k >> I found one post like this earlier (by Xin LI), but nobody seemed >> to have replied... >> in my current conf, I think my kmem/kmem_max is at 512Mb (not sure >> though, since I've edited my file yesterday for next reboot), with >> 2G of system RAM.. Normally I'd run kmem(max) 1G (with arcsize of >> 512M. currently it is at default), but since I just got back to 2G >> total mem after some hardware problems I've been runnig at those >> lows (1G total is kindof tight with zfs..) >> Well, just wanted to report... The box is not totally dead yet, ie >> I can still do Ctrl-T on console, but thats it.. I don't really >> know what more I can do so.. I don't have KDB/DDB. >> I'll wait another hour or so before I hard reboot it, unless it >> "unlocks" or if anyone have any suggestions. > > The key is to increase your kmem and prevent it from being > exhausted. I think more recent OpenSolaris's ZFS code has some > improvements but I do not have spare devices at hand to test and > debug :( Yep, never had the problem when I was running with 2G total mem, but then one stick (damn consumer crap) failed and I was left with 1G, and I started to have random problems. Going to tune kmem back up now when I got more mem again, thinking about putting in 4G too.. > > > Maybe pjd@ would get a new import at some point? I have cc'ed him. > > Cheers, > -- > Xin LI <delphij@delphij.net> http://www.delphij.net/ > FreeBSD - The Power to Serve! >
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