Date: Tue, 6 Oct 2009 08:55:48 +0200 From: Thomas Backman <serenity@exscape.org> To: Dieter <freebsd@sopwith.solgatos.com> Cc: freebsd-performance@freebsd.org Subject: Re: ZFS Re: A specific example of a disk i/o problem Message-ID: <88D64C60-D8ED-4622-959C-9946DBB99198@exscape.org> In-Reply-To: <200910051605.QAA06722@sopwith.solgatos.com> References: <200910051605.QAA06722@sopwith.solgatos.com>
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On Oct 5, 2009, at 6:05 PM, Dieter wrote: > In message <E316139E-FFCF-432F-8DCE-62B120C38E55@exscape.org>, > Thomas Backman writes: > >> I run 8.0-RC1/amd64 with ZFS on an A64 3200+ with 2GB RAM and an old >> 80GB 7200rpm disk. >> >> My problem is that I get completely unacceptable latency on console >> IO >> (both via SSH and serial console) when the system is performing disk >> IO. The worst case I've noticed yet was when I tried copying a core >> dump from a lzjb compressed ZFS file system to a gzip-9 compressed >> one, to compare the file size/compression ratio. screen(1) took at >> LEAST ten seconds - probably a bit more - I'm not exaggerating here - >> to switch to another window, and an "ls" in an empty directory also >> about 5-10 seconds. > > You might find the "RELENG_7 heavy disk = system crawls" thread > interesting: > > } I didn't actually solve it or do anything. > } I just upgraded to RELENG_8. > } > } Now it's behaving more like FreeBSD should. > } I can do sequential reads/writes and still > } use kbd/mouse/X11/buildworld and so on. Doesn't really help much I'm afraid, since 8.0-RC1 = RELENG_8 = stable/ 8. Been running current/stable-8 since May. Regards, Thomas
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