[linux-audio-dev] Re: [PATCH] latency improvements, one reschedule moved

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Subject: [linux-audio-dev] Re: [PATCH] latency improvements, one reschedule moved
From: Roger Larsson (roger.larsson_AT_norran.net)
Date: Wed Jul 05 2000 - 03:50:45 EEST

Hi Linus,

Cleaned up and corrected some bugs...
(memory_pressure... !
 unintended reschedule removed)

Sadly the performance went down - slightly.
Latency looks even nicer. Still some spikes.
[sync and mmap002 behaviour not corrected]

/RogerL

Roger Larsson wrote:
>
> Hi Linus,
>
> [patch against linux-2.4.0-test3-pre2]
>
> I cleaned up kswapd and moved its reschedule point.
> Disk performance is close to the same.
> Latencies have improved a lot (tested with Bennos latencytest)
>
> * sync is still problematic
> * mmap002 (Quintinela) still gives a 212 ms latency
> (compared to 423 ms for the unpatched...)
> * other disk related latencies are down under 30 ms.
> (streaming read, copy, write)
> * the number of overruns has dropped considerably!
> (running 4 buffers with a deadline of 23 ms)
>
> /RogerL
>
> --
> Home page:
> http://www.norran.net/nra02596/
>
> ------------------------------------------------------------------------
> Name: patch-2.4.0-test3-pre2-vmscan.latency.2
> patch-2.4.0-test3-pre2-vmscan.latency.2 Type: Plain Text (text/plain)
> Encoding: 7bit 

--
Home page:
  http://www.norran.net/nra02596/

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