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Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems
From: |
Christian Schoenebeck |
Subject: |
Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance) |
Date: |
Tue, 29 Sep 2020 15:59:34 +0200 |
On Dienstag, 29. September 2020 15:49:42 CEST Vivek Goyal wrote:
> > Depends on what's randomized. If read chunk size is randomized, then yes,
> > you would probably see less performance increase compared to a simple
> > 'cat foo.dat'.
>
> We are using "fio" for testing and read chunk size is not being
> randomized. chunk size (block size) is fixed at 4K size for these tests.
Good to know, thanks!
> > If only the read position is randomized, but the read chunk size honors
> > iounit, a.k.a. stat's st_blksize (i.e. reading with the most efficient
> > block size advertised by 9P), then I would assume still seeing a
> > performance increase.
>
> Yes, we are randomizing read position. But there is no notion of looking
> at st_blksize. Its fixed at 4K. (notice option --bs=4k in fio
> commandline).
Ah ok, then the results make sense.
With these block sizes you will indeed suffer a performance issue with 9p, due
to several thread hops in Tread handling, which is due to be fixed.
Best regards,
Christian Schoenebeck
- 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, 2020/09/25
- 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, 2020/09/25
- Re: virtiofs vs 9p performance(Re: tools/virtiofs: Multi threading seems to hurt performance), Christian Schoenebeck, 2020/09/25
- 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 <=
- 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, 2020/09/29
- 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