Nate Eldredge wrote:
On Sun, 13 Jul 2008, Kris Kennaway wrote:
Nate Eldredge wrote:
Hi folks,
Hopefully this is a good list for this topic.
It seems like there has been a regression in interactivity from
6.3-RELEASE to 7.0-RELEASE when using the SCHED_4BSD scheduler.
After upgrading my single-cpu amd64 box, 7.0 has much worse latency.
When running a kernel compile, there is a noticeable lag to echo my
typing or scroll my browser windows, and playing an mp3 frequently
cuts out for a second or two. This did not happen on 6.3-RELEASE.
Are you sure it's not the x.org server bug that was present in the
version shipped with 7.0? Update to the latest version and see if
your X interactivity improves.
Yes, I had not yet upgraded my x.org port when testing this, so it was
the same x.org that was fine under 6.3. Also:
I wrote a small program which forks two processes that run
gettimeofday() in a tight loop to see how long they get scheduled
out. On 6.3 the maximum latency is usually under 100 ms. On 7.0 it
is 500 ms or more even when nothing else is running on the system.
When a compile is also running it is sometimes 1400 ms or more.
This test shows a difference even in single user mode, when X is not
running at all.
It shows *a* difference, but perhaps not the *same* difference. Please
humour me and rule it out.
Kris
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