On May 14, 2020, at 03:42, Ritesh Harjani <riteshh@xxxxxxxxxxxxx> wrote: > > Hello Alex, > > Few comments to understand the patch better. > >> On 4/28/20 10:50 AM, Alex Zhuravlev wrote: >> Together with the patch "ext4: limit scanning of uninitialized groups" > Where is this patch which says ^^^^^ ? I think that patch was eventually merged into this one? >> the mount time of a 1PB filesystem is reduced significantly: >> 0% full 50%-full unpatched patched >> mount time 33s 9279s 563s > > Looks good. Do you have perf improvement numbers with this patch alone? > Wonder if this could show improvement if I make my FS image using dm-sparse? That is hard to say, because the sparse image may not need seeking when reading the bitmaps. You can test with an artificial delay via DM. >> Lustre-bug-id: https://jira.whamcloud.com/browse/LU-12988 > > Not sure if this is required. This should be kept, as it i the same as existing Debian or Bugzilla tags. It contains a lot more detail on history and earlier versions of the patches. Cheers, Andreas
