Hi I'm announcing the release of a patchset that limits the number of outstanding bios in the device mapper. The patchset is at http://people.redhat.com/~mpatocka/patches/kernel/dm-limit-outstanding-bios/ The default limit is 1024, the minimum limit is 4 (but I verified that the testsuite works even with limit 1). The limit can be set in /sys/block/dm-*/queue/nr_requests The limit for newly created dm devices can be set in /sys/module/dm_mod/parameters/default_nr_requests (for example, you can set it before running the testsuite or some benchmark). The patchset could possibly fix bug 1010466. Note that the patch "punt-to-workqueue.patch" is required, otherwise we get lockups in the testsuite at low nr_requests values. The patch "fix-counting.patch" isn't required, but it is included to avoid patch conflicts. Mikulas -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
