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Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD |
Date: |
Sun, 17 Mar 2013 19:51:00 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130219 Thunderbird/17.0.3 |
Il 17/03/2013 01:04, Aurelien Jarno ha scritto:
> | boot | install build-dep | build lm-sensors |
> ------------------------+------+-------------------+------------------+
> versatile | 1:09 | 2:27 | 4:09 |
> versatile cache=wb | 1:08 | 2:25 | 3:44 |
Strange, cache=wb should be the default.
The real problem with SD is that it doesn't have a flush command, hence
it cannot be made safe against power losses. But the solution is to add
support for virtio-mmio in those boards.
Paolo
> vexpress | 1:11 | 3:07 | 3:49 |
> vexpress cache=wb | 1:07 | 3:07 | 3:47 |
>
> Note: the install build-dep time doesn't include the download time.
>
> So even if the two systems are not directly comparable, it shows that
> the SD card emulation is indeed slower than the hard disk one. That said
> while cache=writeback makes a difference for the versatile platform, it
> doesn't really change anything for the vexpress platform. Therefore
> forcing the users to add this option doesn't seems to be a good idea.
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, (continued)
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Peter Maydell, 2013/03/04
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Aurelien Jarno, 2013/03/04
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Markus Armbruster, 2013/03/06
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Peter Maydell, 2013/03/15
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Aurelien Jarno, 2013/03/15
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Peter Maydell, 2013/03/15
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Aurelien Jarno, 2013/03/16
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Peter Maydell, 2013/03/16
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Aurelien Jarno, 2013/03/17
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Peter Maydell, 2013/03/17
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Peter Maydell, 2013/03/17
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Aurelien Jarno, 2013/03/17
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Paolo Bonzini, 2013/03/18
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Aurelien Jarno, 2013/03/17
- Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD, Paolo Bonzini, 2013/03/17