linux-kernel - Re: [Bug #11875] radeonfb lockup in .28-rc (bisected)

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Message-Id: <1226633351.7178.107.camel@pasglop>
Date:	Fri, 14 Nov 2008 14:29:11 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Miller <davem@...emloft.net>
Cc:	rjw@...k.pl, linux-kernel@...r.kernel.org,
	kernel-testers@...r.kernel.org, akpm@...ux-foundation.org,
	cloos@...loos.com, paul@...ly.ondioline.org,
	torvalds@...ux-foundation.org
Subject: Re: [Bug #11875] radeonfb lockup in .28-rc (bisected)


> It makes a huge difference, with the acceleration patch:
> 
> commit b1ee26bab14886350ba12a5c10cbc0696ac679bf
> Author: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Date:   Wed Oct 15 22:03:46 2008 -0700
> 
>     radeonfb: accelerate imageblit and other improvements
> 
> reverted, the test case takes 25 seconds or more instead of
> the 7 or 8 seconds we're seeing now.

Ok, thanks a lot for those tests !

So I consider the loss of perfs due to the workaround to be minor enough
here. I'll submit the patch for inclusion.

I might look at not doing the clipping in cases things are already
aligned later but I doubt it's going to be worth the pain,

Cheers,
Ben.


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