Re: responsiveness during IO tasks
Alexander Motin wrote: Julian Elischer wrote: Doug Barton wrote: No problem, just let's hunt things down. I'll wait for that larger post. In meantime, if it is related to eventtimers, it would be good to collect more detailed information. You could try to make timer run during idle (kern.eventtimer.idletick). You could try to switch timer from one-shot to periodic mode (kern.eventtimer.periodic). You could also try to switch to another timer (kern.eventtimer.timer). kern.eventtimer.periodic needs to be disabled to run 9.x on xen (as of a few months ago) Yes, but it needs to be enabled (it is disabled by default). I remember about it and going to experiment with it nearest time. Problem with Xen HVM freeze in one-shot mode workarounded by r221508. Also, looking on Xen 4.1 sources, seems like problem was already fixed from their side also. -- Alexander Motin ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: responsiveness during IO tasks
Doug Barton wrote: No problem, just let's hunt things down. I'll wait for that larger post. In meantime, if it is related to eventtimers, it would be good to collect more detailed information. You could try to make timer run during idle (kern.eventtimer.idletick). You could try to switch timer from one-shot to periodic mode (kern.eventtimer.periodic). You could also try to switch to another timer (kern.eventtimer.timer). kern.eventtimer.periodic needs to be disabled to run 9.x on xen (as of a few months ago) ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: responsiveness during IO tasks
Julian Elischer wrote: Doug Barton wrote: No problem, just let's hunt things down. I'll wait for that larger post. In meantime, if it is related to eventtimers, it would be good to collect more detailed information. You could try to make timer run during idle (kern.eventtimer.idletick). You could try to switch timer from one-shot to periodic mode (kern.eventtimer.periodic). You could also try to switch to another timer (kern.eventtimer.timer). kern.eventtimer.periodic needs to be disabled to run 9.x on xen (as of a few months ago) Yes, but it needs to be enabled (it is disabled by default). I remember about it and going to experiment with it nearest time. -- Alexander Motin ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: responsiveness during IO tasks
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) -- Nothin' ever doesn't change, but nothin' changes much. -- OK Go Breadth of IT experience, and depth of knowledge in the DNS. Yours for the right price. :) http://SupersetSolutions.com/ ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: responsiveness during IO tasks
Doug Barton wrote: On 04/26/2011 03:37, Alexander Best wrote: On Mon Apr 25 11, Steve Wills wrote: 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. Doug (sorry mav) No problem, just let's hunt things down. I'll wait for that larger post. In meantime, if it is related to eventtimers, it would be good to collect more detailed information. You could try to make timer run during idle (kern.eventtimer.idletick). You could try to switch timer from one-shot to periodic mode (kern.eventtimer.periodic). You could also try to switch to another timer (kern.eventtimer.timer). -- Alexander Motin ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
Re: responsiveness during IO tasks
On Mon Apr 25 11, Steve Wills wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 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? cheers. alex Thanks, Steve -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.17 (FreeBSD) iQEcBAEBAgAGBQJNtiDLAAoJEPXPYrMgexuh2hgIAK4a33NtKUNP5bDy9nCumjNM Y+0WYxio72kDEUR0KPGJKB8TT3qV4DAknvydEvOTvXNQq2GZUX5WvJKu0cNwbg7g qQt7xawaQq9NkE4dGJLMgDRDrkGVzHEFFHKegmFl8l9WnUxC8ffAjEvtW63Lcefe xLzo9s3SbfmKS5p6dm/EXx49rSrtZv3uENnPBErXDY4Vd6LtNRBV2umk2GzU0Jgr HdOcZVv+MOSEbIMavJidRtYE5Ous0XYRBYFF+ZHhRVkLQ4yIj2OXmQiB0IjYh11O gX0NcHSBA8Pe6WbRRpcUbS0Evr4ur/n1VWgwZB/Bfbrtt0RnFbRDNCnBfOLAhuw= =ZgkD -END PGP SIGNATURE- -- a13x ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
responsiveness during IO tasks
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 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? Thanks, Steve -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.17 (FreeBSD) iQEcBAEBAgAGBQJNtiDLAAoJEPXPYrMgexuh2hgIAK4a33NtKUNP5bDy9nCumjNM Y+0WYxio72kDEUR0KPGJKB8TT3qV4DAknvydEvOTvXNQq2GZUX5WvJKu0cNwbg7g qQt7xawaQq9NkE4dGJLMgDRDrkGVzHEFFHKegmFl8l9WnUxC8ffAjEvtW63Lcefe xLzo9s3SbfmKS5p6dm/EXx49rSrtZv3uENnPBErXDY4Vd6LtNRBV2umk2GzU0Jgr HdOcZVv+MOSEbIMavJidRtYE5Ous0XYRBYFF+ZHhRVkLQ4yIj2OXmQiB0IjYh11O gX0NcHSBA8Pe6WbRRpcUbS0Evr4ur/n1VWgwZB/Bfbrtt0RnFbRDNCnBfOLAhuw= =ZgkD -END PGP SIGNATURE- ___ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to freebsd-current-unsubscr...@freebsd.org
