LKML watch

[William Cohen]

Looking over LKML Found the two threads that have stuff of interest to
SystemTap work.


sendfile() with 100 simultaneous 100MB files
http://www.ussg.iu.edu/hypermail/linux/kernel/0601.2/2077.html

Performance problems when sending many large files. Not clear what the
root cause is. Currently, workaround in userspace. Ben LaHaise
had a hypthesis that it was requests overrun in the disk elevator:

http://www.ussg.iu.edu/hypermail/linux/kernel/0601.2/2378.html

There is a bugzilla entry for this problem:

http://bugzilla.kernel.org/show_bug.cgi?id=5949

---

RCU latency regression in 2.6.16-rc1
http://www.ussg.iu.edu/hypermail/linux/kernel/0601.3/0022.html

Port of latency tracer used to show latency problem. This is the type
of problem that people would be interested in using SystemTap for.

The latency tracer patches:
http://people.redhat.com/mingo/latency-tracing-patches/

-Will