[Beignet] Haswell-ULT Support?

[Zhigang Gong]

Thanks for the result.

I'll update README.md according to mengmeng's result. Although reverting that
commit could make beignet workable without the command parser issue, we still
have to face the secure batch buffer issue which requires to apply the kernel patch.
And the side effect of reverting that commit is the atomic related workload will hit
a major performance issue. One example is in darktable, one filter kernel execution
time will increase to 50s from 0.5s without tat commit.

Thanks,
Zhigang Gong.

On Tue, Apr 14, 2015 at 08:05:43AM +0000, Meng, Mengmeng wrote:
> Hi,
>    With 4.0.0-rc6 kernel (enable_cmd_parser=1 as default), the HSW issue also exists on Release_v1.0 branch:1.0.1, 1.0.2, and the latest git. 
> But it is OK on 1.0.0 (git-59142eb). The bisected commit is also git-7ecc5b9d.
> 
> 
> 
> 
> 
> Thanks,
> Meng
> 
> -----Original Message-----
> From: Zhigang Gong [mailto:zhigang.gong at linux.intel.com] 
> Sent: Tuesday, April 14, 2015 2:04 PM
> To: Rebecca N. Palmer; Meng, Mengmeng
> Cc: Julian Simioni; beignet at lists.freedesktop.org
> Subject: Re: [Beignet] Haswell-ULT Support?
> 
> Not sure whether it's helpful. We need to do some experiments on HSW with latest kernel.
> Mengmeng, could you help to test Release_v1.0 branch with 4.0.0-rc6 kernel? Maybe bisect on beignet side to find out the first bad commit?
> 
> Thanks.
> 
> On Fri, Apr 10, 2015 at 12:01:48PM +0100, Rebecca N. Palmer wrote:
> > On 10/04/15 09:56, Zhigang Gong wrote:
> > >I think I know the cause now. Because beignet uses some new registers 
> > >which are not in the whitelist (not included in c9224f). These new 
> > >registers are to enable atomic on L3 which is disabled by KMD by default.
> > 
> > The obvious place matching that description is 
> > http://cgit.freedesktop.org/beignet/commit/?h=Release_v1.0&id=7ecc5b9d
> > 8d5baf4e049ade885ece3c1a1d6cab1b ...but that's between 1.0.0 and 
> > 1.0.1, so can't explain "have tried unsuccessfully to run Beignet 
> > 1.0.0, 1.0.1, 1.0.2, and the latest git".
> > 
> > Does reverting that commit help at all?
> > 
> > _______________________________________________
> > Beignet mailing list
> > Beignet at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/beignet
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