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Re: LKML watch
- From: William Cohen <wcohen at redhat dot com>
- To: Hien Nguyen <hien at us dot ibm dot com>
- Cc: SystemTAP <systemtap at sources dot redhat dot com>
- Date: Thu, 26 Jan 2006 11:58:37 -0500
- Subject: Re: LKML watch
- References: <43CFF71D.4090502@us.ibm.com>
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