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Re: [Qemu-devel] [PATCH V4 10/12] SD card users: optimize access to SDCl
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From: |
Peter Maydell |
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Subject: |
Re: [Qemu-devel] [PATCH V4 10/12] SD card users: optimize access to SDClass methods |
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Date: |
Tue, 31 Jul 2012 18:47:50 +0100 |
On 31 July 2012 18:33, Igor Mitsyanko <address@hidden> wrote:
> On 07/31/2012 07:43 PM, Peter Maydell wrote:
>> Anthony claims that SD_GET_CLASS should be cheap enough that we don't
>> need to hoist it out of loops like this. Do you have profiling data
>> or similar that caused you to write this patch?
> Well, I've tested it by measuring an execution time of a 4Kb write to SD
> card, results showed that arithmetic mean of time for one 4k write was less
> by ~300us in sequence with SD_GET_CLASS extracted from the loop.
How much is that as a % of the total time for the write ?
-- PMM
- Re: [Qemu-devel] [PATCH V4 11/12] SD card: introduce "spi" property for SD card objects, (continued)
[Qemu-devel] [PATCH V4 08/12] hw/sd.c: add SD card save/load support, Igor Mitsyanko, 2012/07/27
[Qemu-devel] [PATCH V4 10/12] SD card users: optimize access to SDClass methods, Igor Mitsyanko, 2012/07/27
[Qemu-devel] [PATCH V4 07/12] hw/sd.c: make sd_wp_addr() return bool, Igor Mitsyanko, 2012/07/27
[Qemu-devel] [PATCH V4 12/12] hw/sd.c: introduce SD card "drive" property, Igor Mitsyanko, 2012/07/27