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Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virt
From: |
Ming Lei |
Subject: |
Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support |
Date: |
Sat, 16 Aug 2014 16:20:24 +0800 |
On 8/16/14, Paolo Bonzini <address@hidden> wrote:
> Il 14/08/2014 12:46, Kevin Wolf ha scritto:
>> So to finally reply with some numbers... I'm running fio tests based on
>> Ming's configuration on a loop-mounted tmpfs image using dataplane.
>
> I'm not sure tmpfs is a particularly useful comparison, since it doesn't
> support O_DIRECT. O_DIRECT over ramdisk ("modprobe brd rd_nr=1
> rd_size=524288 max_part=1", either directly or via a filesystem) is
> probably a better benchmark.
If loop is over file from tmpfs, that is fine since loop itself supports
O_DIRECT and the sync ->read()/->write() inside loop driver can
return without block.
I have tested loop over tmpfs file, and can't reproduce Kevin's issue.
>
> Also, I'm not sure how the I/O scheduler works over tmpfs. A ramdisk
> should just do the right thing. (Are you using deadline or cfq?)
>
>> | Random throughput | Sequential throughput
>> ----------------+-------------------+-----------------------
>> master | 442 MB/s | 730 MB/s
>> base | 453 MB/s | 757 MB/s
>> bypass (Ming) | 461 MB/s | 734 MB/s
>> coroutine | 468 MB/s | 716 MB/s
>> bypass (Paolo) | 476 MB/s | 682 MB/s
>
> This is pretty large, but it really smells like either a setup problem
> or a kernel bug...
>
> Paolo
>
Thanks,
--
Ming Lei
- Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support, (continued)
- Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support, Stefan Hajnoczi, 2014/08/13
- Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support, Ming Lei, 2014/08/13
- Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support, Paolo Bonzini, 2014/08/13
- Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support, Ming Lei, 2014/08/13
- Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support, Kevin Wolf, 2014/08/14
- Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support, Ming Lei, 2014/08/15
- Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support, Paolo Bonzini, 2014/08/15
- Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support,
Ming Lei <=
- Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support, Paolo Bonzini, 2014/08/17
- Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support, Kevin Wolf, 2014/08/18
- Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support, Stefan Hajnoczi, 2014/08/06