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.
Kris
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.
SCHED_ULE is much better, so I've switched over. But it's not the
default yet, and most people are still going to be using SCHED_4BSD. It
used to be acceptable but now it isn't. Does anyone know why it's
regressed so badly?
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