Re: about the xfs performance

[Songbo Wang <hack.coo@xxxxxxxxx>]

HiïEmmanuel

Thank you for your reply , I have two types of pcie-ssd cards: Intel P3600 ÂandÂES3000 V2 PCIe SSD ;

I did this testing as you mentioned above , but the results are also bad.Â

2016-04-12 0:10 GMT+08:00 Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>:

Le Mon, 11 Apr 2016 22:14:06 +0800
Songbo Wang <hack.coo@xxxxxxxxx> Ãcrivait:

>Â Â Â mkfs: mkfs.xfs /dev/hioa2 -f -n size=64k -i size=512 -d
> agcount=40 -l size=1024m.
>Â Â Â mount: mount /dev/hioa2 /mnt/Â -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 210kÂïbut some
> seconds later, the results down to 19kÂ.

You should first try default mkfs settings, with default mount options.
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).

--
------------------------------------------------------------------------
Emmanuel Florac  Â| ÂDirection technique
          | ÂIntellique
          | Â<eflorac@xxxxxxxxxxxxxx>
          | Â+33 1 78 94 84 02
------------------------------------------------------------------------