Control: tags -1 + moreinfo Hi Jason,
On Thu, Dec 21, 2017 at 11:30:28AM -0500, Jason Gill wrote: > Package: src:linux > Version: 3.16.51-3 > Severity: normal > > Writing a large number of files to an XFS system with a larger > directory block size causes slow performance and kernel log errors re: > memory allocation deadlocks. > > On the surface, looks very similar to this ubuntu issue: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1382333 > > This has been reproducible on 2/2 systems I've tried so far. > > xfs_info output for the affected filesystem: > meta-data=/dev/sdf isize=2048 agcount=55, agsize=268435455 > blks > = sectsz=512 attr=2, projid32bit=1 > = crc=0 finobt=0 > data = bsize=4096 blocks=14648409600, imaxpct=1 > = sunit=0 swidth=0 blks > naming =version 2 bsize=65536 ascii-ci=0 ftype=0 > log =internal bsize=4096 blocks=521728, version=2 > = sectsz=512 sunit=0 blks, lazy-count=1 > realtime =none extsz=4096 blocks=0, rtextents=0 > > To reproduce, make an XFS filesystem with a large directory block size: > # /sbin/mkfs.xfs -n size=64k /dev/sdXX > > Then mount the new filesystem and create a large number of small files > quickly: > $ seq -w 0 10000000 | xargs -P8 -n 256 touch I have not looked into the fs/xfs history to find potential relevant changes, but can you still reproduce the issue with recent kernels? In a testsetup, but only quickly looked, I was not able to reproduce the behaviour. But possibly the issue could be still unfixed. Regards, Salvatore
