Dne 7.3.2011 03:59, Martin K. Petersen napsal(a): >>>>>> "Zdenek" == Zdenek Kabelac <zkabelac@xxxxxxxxxx> writes: > > Zdenek> My finding seems to show that BIP-256 slabtop segment grow by > Zdenek> ~73KB per each device (while dm-io is ab out ~26KB) > > Ok, I see it now that I tried with a bunch of DM devices. > > DM allocates a bioset per volume. And since each bioset has an integrity > mempool you'll end up with a bunch of memory locked down. It seems like > a lot but it's actually the same amount as we reserve for the data path > (bio-0 + biovec-256). > > Since a bioset is not necessarily tied to a single block device we can't > automatically decide whether to allocate the integrity pool or not. In > the DM case, however, we just set up the integrity profile so the > information is available. > > Can you please try the following patch? This will change things so we > only attach an integrity pool to the bioset if the logical volume is > integrity-capable. > Yep - patch seems to fix the problem with wasted memory. Thanks tested-by: zkabelac@xxxxxxxxxx -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
