In message , Thomas Backman writes:
> I run 8.0-RC1/amd64 with ZFS on an A64 3200+ with 2GB RAM and an old

quoted text
> 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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