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On Wed, 13 Sep 2000, Benno Senoner wrote:
> Hi folks,
> I benchmarked Ingo's lowlatency-2.4.0-test7-A0 kernel
> (
> I can only say that it looks VERY promising ( < 1msec latencies !)
> But there seems to be problems with the kernel disk sync code:
> After the disk stress test, I call the "sync" command, but unfortunately
> the sync process hangs and eats 100% of the CPU (but no kernel crash)

I also had similar problems with with not being able to complete the tests
because of the sync call hanging. The tests that did finish looked really
good though!

> see the graph here:

Looks alot like the graphs I got.

> (disk copy and disk read tests are missing because, of the hanging sync)
> Is this perhaps related to the truncate bug fixed in -test8 ?
> Ingo, any ideas what the cause of the hang could be ?
> (let us know please when you port the patch to test8)

Yes, definitely!


> Anyway if the remaining bugs can be fixed, then I think that that
> all low latency needs of 2.4 users will be satisfied.
> (my reference mark is being able to stay below 1.5 - 2msec, which
> is needed for perceptually delayfree realtime audio processing)
> PS: looking at the results Chris posted,
> Andrew's minimalistic approach looks promising too and seems to
> be able to guarantee <5msec latencies under high load.
> cheers,
> Benno.

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