Date: Mon, 05 Oct 2009 09:05:49 PDT From: Dieter <freebsd@sopwith.solgatos.com> To: freebsd-performance@freebsd.org Subject: ZFS Re: A specific example of a disk i/o problem Message-ID: <200910051605.QAA06722@sopwith.solgatos.com> In-Reply-To: Your message of "Mon, 05 Oct 2009 10:45:48 %2B0200." <E316139E-FFCF-432F-8DCE-62B120C38E55@exscape.org>
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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.
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