On 2020/1/24 下午4:46, Anand Jain wrote: > > > On 24/1/20 3:28 PM, Qu Wenruo wrote: >> >> >> On 2020/1/24 下午3:25, Anand Jain wrote: >>> There are known performance and counting errors for the quota when >>> qgroup is >>> enabled. >> >> Counting error is a big problem, please report if you found one not >> caused by impersistent qgroup status. > > I mean the already known issues btrfs/153 (count error on write to > falloc-ed space) This is not count error, it's reserved space/limit error. >and btrfs/179 (after a lot of snapshot > create and distroy with fsstress on subvol the btrfs check > reports qgroup count diff). I haven't yet reproduce it, it would be nice to have a separate report. > >> For performance, we still have problem, but that should only be snapshot >> dropping. >> Balance is no longer a big problem. >> >> Personally I think the current man page still stands. > > IMO kernel version in the man page is bit confusing though when > its still unstable. OK, for the kernel version part the patch makes sense. Thanks, Qu > > Thanks, Anand > >> Thanks, >> Qu >>> >>> Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx> >>> --- >>> Documentation/btrfs-qgroup.asciidoc | 3 +-- >>> 1 file changed, 1 insertion(+), 2 deletions(-) >>> >>> diff --git a/Documentation/btrfs-qgroup.asciidoc >>> b/Documentation/btrfs-qgroup.asciidoc >>> index 0c9f5940a1d3..2da3d7819ba6 100644 >>> --- a/Documentation/btrfs-qgroup.asciidoc >>> +++ b/Documentation/btrfs-qgroup.asciidoc >>> @@ -16,8 +16,7 @@ DESCRIPTION >>> NOTE: To use qgroup you need to enable quota first using *btrfs >>> quota enable* >>> command. >>> -WARNING: Qgroup is not stable yet and will impact performance in >>> current mainline >>> -kernel (v4.14). >>> +WARNING: Qgroup is an unstable feature as of now. >>> QGROUP >>> ------ >>> >>
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