about the xfs performance

[Songbo Wang]

Hi，Emmanuel
Thank you for your reply , I have two types of pcie-ssd cards: Intel P3600
 and ES3000 V2 PCIe SSD ;
I did this testing as you mentioned above , but the results are also bad.

2016-04-12 0:10 GMT+08:00 Emmanuel Florac <eflorac at intellique.com>:

> Le Mon, 11 Apr 2016 22:14:06 +0800
> Songbo Wang <hack.coo at gmail.com> 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.
> 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     |   Direction technique
>                     |   Intellique
>                     |   <eflorac at intellique.com>
>                     |   +33 1 78 94 84 02
> ------------------------------------------------------------------------
>
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