[Nouveau] "enable ctxprog xfer only when we need it to save power" introduces big performance regression

[Maarten Maathuis]

On Sat, Oct 29, 2011 at 7:29 PM, Marcin Slusarz
<marcin.slusarz at gmail.com> wrote:
> On Sat, Oct 29, 2011 at 07:08:01PM +0200, Marcin Slusarz wrote:
>> Hi
>>
>> I've bisected pretty big performance regression (nv92):
>>
>> $ git bisect good
>> b2737681d5442f05ab6419e05468c3d2511a5ced is the first bad commit
>> commit b2737681d5442f05ab6419e05468c3d2511a5ced
>> Author: Martin Peres <martin.peres at ensi-bourges.fr>
>> Date:   Sat Jul 30 23:08:45 2011 +0200
>>
>>     drm/nv50/gr: enable ctxprog xfer only when we need it to save power
>
> Weird, reverting it on top of current git does not restore it - in
> glxgears it's even worse (-~50%).
>
> Marcin
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Before this patch, what ensured that context switching was enabled?

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