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Re: [Qemu-devel] [PATCH 0/2] macio: switch over to new byte-aligned DMA
Re: [Qemu-devel] [PATCH 0/2] macio: switch over to new byte-aligned DMA helpers
Mon, 30 May 2016 23:19:11 +0200
On 2016-05-27 09:48, Mark Cave-Ayland wrote:
> Here is a tidied up version of my patch to convert the macio controller over
> using the new byte-aligned DMA helpers.
> The first patch is just a hack and temporarily disables unaligned iovec
> truncation in the DMA helper (as discussed in the recent thread) until Paolo
> someone else can devise a proper solution. Without this, the subsequent switch
> over to the DMA helpers will appear to work during a Darwin PPC install but
> resulting image is corrupt and will fail to boot.
> The second patch is the real one and switches the macio controller over to use
> the new byte-aligned DMA helpers. Here I see a speed-up of around 2.5x-3x for
> a typical Darwin PPC installation compared to the previous code.
> Aurelien, I'd be grateful if you could test the TRIM path as I know this is
> something you've had issues with before and I couldn't quite figure out how to
> reproduce your TRIM tests from before.
I have just tested the TRIM path, all works fine with your 2 patches
Aurelien Jarno GPG: 4096R/1DDD8C9B