On 4/11/16 11:10 AM, Emmanuel Florac wrote: > Le Mon, 11 Apr 2016 22:14:06 +0800 > Songbo Wang <hack.coo@xxxxxxxxx> écrivait: > >> mkfs: mkfs.xfs /dev/hioa2 -f -n size=64k -i size=512 -d >> agcount=40 -l size=1024m. >> mount: mount /dev/hioa2 /mnt/ -t xfs -o >> rw,noexec,nodev,noatime,nodiratime,nobarrier,discard,inode64,logbsize=256k,delaylog >> I use the following command to test iops: fio -ioengine=libaio -bs=4k >> -direct=1 -thread -rw=randwrite -size=50G -filename=/mnt/test >> -name="EBS 4KB randwrite test" -iodepth=64 -runtime=60 >> The results is normal at the beginning which is about 210k±，but some >> seconds later, the results down to 19k±. > > You should first try default mkfs settings, with default mount options. Agreed. Where did that set of options come from, in any case? -Eric > Normally mkfs.xfs should initiate a TRIM on the SSD, therefore > performance should remain predictable. > > What model of SSD card are you using? With an HGST NVMe SN1x0 I've got > very consistent results (no degradation with time). > _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
