Follow up: This behavior occurs with kernel 2.6.34.1 - with 2.6.33.5 I do not see this irrational behavior. Though the flush threads pop up in top regularly, they 'only' eat up 1-2% of CPU for the system. Should this go to LKML? Regards -Sven On Sun, 2010-07-18 at 21:18 +0200, Sven Eschenberg wrote: > Hi list, I am having difficulties with one of my boxes. > > Mainly this: > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 2262 root 20 0 0 0 0 R 25 0.0 836:51.10 flush-253:2 > 2363 root 20 0 0 0 0 R 25 0.0 838:28.16 flush-253:6 > 2364 root 20 0 0 0 0 R 25 0.0 916:14.92 flush-253:4 > 2365 root 20 0 0 0 0 R 25 0.0 855:02.50 flush-253:1 > 2362 root 20 0 0 0 0 R 23 0.0 916:14.92 flush-253:5 > 3090 root 20 0 0 0 0 R 23 0.0 853:27.24 flush-253:3 > > I was wondering what these flush processes are, I could determine they are > kernel based threads (as far as I can see). > Since they are called flush, I'd asume they have to do with flushing > buffers or whatsoever, so I came to the conclusion, that the numbers might > be major:minor pairs. > > Using lvs, I get: > > LV KMaj KMin > Root 253 1 > home 253 3 > var 253 2 > usr 253 5 > usr.portage 253 4 > www 253 6 > > And I certainly do not believe that there should be flush proceses hogging > the CPU 24/7, and al those threads belong to logical volumes, or devie > mapper devices (there are more, with a little les cpu time created by > kpartx). > > Is this a known bug? Any recommendation what to do? > > Regards > > -Sven > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
