Messages in this thread | | | From | Simon Farnsworth <> | Subject | Re: [Intel-gfx] Interrupt latency on some 945GM platforms | Date | Fri, 17 Sep 2010 10:02:08 +0100 |
| |
On Thursday 16 September 2010, Vasily Khoruzhick <anarsoul@gmail.com> wrote: > В сообщении от 15 of September 2010 01:41:11 автор Sitsofe Wheeler написал: > > > > processor.max_cstate=2 > > > > > > Nope, it doesn't work with max_cstate=2 > > > > Perhaps intel_idle is being used? Any mention of it in dmesg? > > Sitsofe, maybe you misunderstood me, I mean with max_cstate=1 graphics is > smooth, with higher values (i.e. max_cstate=2) graphics is jerky. > > Btw, Jesse, any comments/solutions/workarounds except one with > processor.max_cstate=1 in kernel commandline? Should I file a bug on fdo > bugzilla?
This looks like a problem I've seen on some hardware.
My workaround has been to use the pm_qos /dev/cpu_dma_latency interface to request a maximum latency of 1ms (value chosen as definitely small enough - a larger value may be better, but I don't care about power saving at runtime on my kit).
If it's happening on other kit, perhaps the i915 driver should make a suitable pm_qos request itself. Jesse, can you comment? -- Simon Farnsworth Software Engineer ONELAN Limited http://www.onelan.com/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |