Hi Fu,
Luotao Fu wrote:
Hi Wolfgang,
I finally found some time and did some tests with your config file and the shiny
new 2.6.25.8-rt7
On Thu, Jun 19, 2008 at 04:04:10PM +0200, Wolfgang Grandegger wrote:
Hi Fu,
Luotao Fu wrote:
Keep in mind that I'm running Linux on a rootfs mounted via NFS.
I have exactly the same test configuration here.
Again everything looks just fine to me. Depending on which debugging Option are
turned on my max. results pended between 70 and 350 us. However I could not
produce any peak worst case values, which are so far away from the average like
in your case.
The .config you send me correspond to what latency (debugging options
turned on).
Have you tried the new -rt patch on your board? Still any strange results?
I just re-tested 2.6.25.8-rt7 with a .config as close as possible to
yours. Still, the latency measured with "cyclictest -p 98 -n -t1 -i1000"
goes up to 600us within a few minutes. I also re-measured latencies
with older kernel version:
RT kernel Max. latency
2.6.25.8-rt7 605 us
2.6.24.7-rt13 230 us
2.6.24.4-rt4 130 us
I will now try to narrow down the latency evils.
Wolfgang.
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