Messages in this thread | | | Date | Sat, 1 Mar 2008 12:42:04 +0000 | From | Simon Huggins <> | Subject | Re: Scheduler broken? sdhci issues with scheduling |
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(please cc me)
On Fri, Feb 29, 2008 at 09:39:14PM +0100, Ingo Molnar wrote: > * Simon Huggins <huggie@earth.li> wrote: > > On Fri, Feb 29, 2008 at 02:34:33PM +0100, Ingo Molnar wrote: > > > * Simon Huggins <huggie@earth.li> wrote: > > > > [ Please Cc me on replies ] > > > > I had a bug with sdhci which Pierre Ossman looked at for me. > > > > In the end essentially the fix was to use HZ=1000 and nothing else. > > > > Pierre seemed to think that this was a bug in the scheduler. > > > does the patch below help, even if you keep HZ=100? This doesnt look > > > like a scheduler issue, it's more of a timer/timing issue. Different HZ > > > means different msleep() results - and the mmc code does a loop of small > > > msleep delays. > > Thanks for looking at it. > > I did tests with 2.6.24.3 with HZ=1000 and HZ=100 and as expected the > > latter didn't work. [..] > > That doesn't work. I did a test with HZ=100 and this patch. I've > > attached the log as patch1-log.
> > Anything else I can try? > so neither precise, nor imprecise timings help??
I don't know. I don't really understand the patches I applied I'm afraid; I'm just reporting the results.
I've cc'd Pierre Ossman so he might have a look from the sdhci point of view.
Pierre, the thread starts here: http://lkml.org/lkml/2008/2/29/118
Simon.
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