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Re: [Qemu-devel] [PATCH V4 10/12] SD card users: optimize access to SDCl

From: Igor Mitsyanko
Subject: Re: [Qemu-devel] [PATCH V4 10/12] SD card users: optimize access to SDClass methods
Date: Tue, 31 Jul 2012 22:33:08 +0400
User-agent: Mozilla/5.0 (X11; Linux i686; rv:14.0) Gecko/20120714 Thunderbird/14.0

On 07/31/2012 10:15 PM, Anthony Liguori wrote:
How many loop iterations that?  300us is a huge amount of time, unless
you were looping on every byte, I have a hard time understanding that

I'm not sure I understand what you mean, I did loop on every byte, that's how our SD model works. So, for 4K bytes qemu have to call SD_GET_CLASS >4K times. Or you're asking about write sequence length? It was 10 writes of 4096 bytes (not statistically reliable, I have to agree).

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