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Re: [Qemu-ppc] [Qemu-devel] [PATCH 0/2] macio: switch over to new byte-a

From: Mark Cave-Ayland
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH 0/2] macio: switch over to new byte-aligned DMA helpers
Date: Tue, 31 May 2016 08:02:06 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.8.0

On 30/05/16 22:19, Aurelien Jarno wrote:

> 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 
>> to
>> 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 
>> or
>> 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 
>> the
>> 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
> applied.

Thanks a lot for testing this, Aurelien. In that case I'll resubmit
patch 2 officially once Paolo has figured out the correct solution for
the iovec truncation.



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