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Re: [Virtio-fs] virtiofs vs 9p performance(Re: tools/virtiofs: Multi thr
From: |
Vivek Goyal |
Subject: |
Re: [Virtio-fs] virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance) |
Date: |
Tue, 29 Sep 2020 11:28:12 -0400 |
On Tue, Sep 29, 2020 at 03:49:04PM +0200, Miklos Szeredi wrote:
> On Tue, Sep 29, 2020 at 3:18 PM Vivek Goyal <vgoyal@redhat.com> wrote:
>
> > - virtiofs cache=none mode is faster than cache=auto mode for this
> > workload.
>
> Not sure why. One cause could be that readahead is not perfect at
> detecting the random pattern. Could we compare total I/O on the
> server vs. total I/O by fio?
Ran tests with auto_inval_data disabled and compared with other results.
vtfs-auto-ex-randrw randrw-psync 27.8mb/9547kb 7136/2386
vtfs-auto-sh-randrw randrw-psync 43.3mb/14.4mb 10.8k/3709
vtfs-auto-sh-noinval randrw-psync 50.5mb/16.9mb 12.6k/4330
vtfs-none-sh-randrw randrw-psync 54.1mb/18.1mb 13.5k/4649
With auto_inval_data disabled, this time I saw around 20% performance jump
in READ and is now much closer to cache=none performance.
Thanks
Vivek
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), (continued)
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Dr. David Alan Gilbert, 2020/09/25
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Christian Schoenebeck, 2020/09/27
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Vivek Goyal, 2020/09/29
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Christian Schoenebeck, 2020/09/29
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Vivek Goyal, 2020/09/29
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Christian Schoenebeck, 2020/09/29
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Vivek Goyal, 2020/09/29
- Re: [Virtio-fs] virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Miklos Szeredi, 2020/09/29
- Re: [Virtio-fs] virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Vivek Goyal, 2020/09/29
- Re: [Virtio-fs] virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Miklos Szeredi, 2020/09/29
- Re: [Virtio-fs] virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance),
Vivek Goyal <=
- Re: tools/virtiofs: Multi threading seems to hurt performance, Dr. David Alan Gilbert, 2020/09/25
- Re: tools/virtiofs: Multi threading seems to hurt performance, Vivek Goyal, 2020/09/25
Re: tools/virtiofs: Multi threading seems to hurt performance, Vivek Goyal, 2020/09/21
Re: [Virtio-fs] tools/virtiofs: Multi threading seems to hurt performance, Chirantan Ekbote, 2020/09/23