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Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performan
From: |
Vivek Goyal |
Subject: |
Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance) |
Date: |
Fri, 19 Feb 2021 11:08:48 -0500 |
On Fri, Sep 25, 2020 at 10:06:41AM +0200, Christian Schoenebeck wrote:
> On Freitag, 25. September 2020 00:10:23 CEST Vivek Goyal wrote:
> > In my testing, with cache=none, virtiofs performed better than 9p in
> > all the fio jobs I was running. For the case of cache=auto for virtiofs
> > (with xattr enabled), 9p performed better in certain write workloads. I
> > have identified root cause of that problem and working on
> > HANDLE_KILLPRIV_V2 patches to improve WRITE performance of virtiofs
> > with cache=auto and xattr enabled.
>
> Please note, when it comes to performance aspects, you should set a
> reasonable
> high value for 'msize' on 9p client side:
> https://wiki.qemu.org/Documentation/9psetup#msize
Hi Christian,
I am not able to set msize to a higher value. If I try to specify msize
16MB, and then read back msize from /proc/mounts, it sees to cap it
at 512000. Is that intended?
$ mount -t 9p -o trans=virtio,version=9p2000.L,cache=none,msize=16777216
hostShared /mnt/virtio-9p
$ cat /proc/mounts | grep 9p
hostShared /mnt/virtio-9p 9p
rw,sync,dirsync,relatime,access=client,msize=512000,trans=virtio 0 0
I am using 5.11 kernel.
Thanks
Vivek
- Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance),
Vivek Goyal <=
- Re: Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance), Christian Schoenebeck, 2021/02/19
- Re: Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance), Vivek Goyal, 2021/02/19
- Re: Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance), Christian Schoenebeck, 2021/02/20
- Re: Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance), Greg Kurz, 2021/02/22
- Re: Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance), Christian Schoenebeck, 2021/02/22
- Re: Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance), Greg Kurz, 2021/02/22
- Re: Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance), Christian Schoenebeck, 2021/02/23
- Re: Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance), Michael S. Tsirkin, 2021/02/23
- Re: Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance), Christian Schoenebeck, 2021/02/24
- Re: Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance), Dominique Martinet, 2021/02/24