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Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virt
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support |
Date: |
Fri, 15 Aug 2014 22:15:01 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 |
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.
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
- 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 <=
- Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support, Ming Lei, 2014/08/16
- 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