On Fri, Sep 22, 2017 at 07:31:45PM +0200, Greg KH wrote: > On Fri, Sep 22, 2017 at 10:16:06AM -0700, Eduardo Valentin wrote: > > Hello GregKH, > > > > I have been seeing several reports of performance issue with raid0 while performing fstrim on v4.9.y. > > Currently, if one performs: > > > > # fio --name fio_test_file --direct=1 --rw=randwrite --bs=4k --size=5G --numjobs=8 --group_reporting --directory=/mount/raid0 > > # rm -rf /media/nvme-raid0 > > # time fstrim -vvv -a > > real 3m41.102s > > user 0m0.000s > > sys 0m4.964s > > Also, is this a regression from older kernels? I personally did not try older than 4.9 kernels. but looking at git history, and the commit message of the fix, looks like this is long known issue that got fixed on v4.12. > > thanks, > > greg k-h > -- All the best, Eduardo Valentin