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.
--
Nate Eldredge
[EMAIL PROTECTED]
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