On 04/26/2011 03:37, Alexander Best wrote:
On Mon Apr 25 11, Steve Wills wrote:
Hi,
I've noticed lately that when doing heavy IO, my 9-CURRENT system (Fri
Apr 15 23:33:46 EDT 2011) is quite unresponsive. I have two ZFS mirrors
setup and run KDE4. The system has 12GB of RAM.
When I, for example, copy an ISO image from one mirror to the other, the
whole desktop becomes really slow during the copy. It takes a good 15
seconds to open a new tab in Konsole, switching windows takes a while,
etc. Once the copy is finished, things are fine. It wasn't like this
back before I upgraded from 8.2-RC1 to 9-CURRENT. Has anyone else
noticed something similar, or is it just me? Is there any other info I
can provide or something I should look for?
i've noticed this too. for me the situation is sometimes even worse. during
heavy i/o the mouse cursor won't even respond.
i think this is a scheduler isse. maybe running a non-preemptive kernel or
switching to the old 4bsd scheduler fixes it?
Try backing up your src tree to r212540, clean /usr/obj,
buildworld/kernel and see if that helps. I just tracked down a big part
of my current problem (pun intended) to r212541, the one-shot timer
commit. I'm working on a larger post to describe my problems, but short
version is, up through r212540 I can load the system down as heavily as
I want, and while there may be some unresponsiveness it's at least
stable. If I update to one-shot timers the system wedges as soon as I
put load on it. No panic, not even a reboot, it just wedges solid
requiring it to be powered off.
You should also test SCHED_4BSD to see if that improves your situation.
There have been a lot of reports about problems with SCHED_ULE with
heavy disk i/o. Moving to 4bsd helps me in terms of interactivity, but I
needed to find the crashing problem first.
hth,
Doug (sorry mav)
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