Re: [uml-devel] Recent patches of note

[Anthony B. <Ant...@ou...>]

Well, so far this seems to be running fine. However, I'm still seeing the =
load average >=3D 1 issue. This is a 2.6.12-rc6-mm1 host with your patches =
from this morning running on a 2.6.11.7-skas3-v8 custom built host kernel.

I'll keep at eye on perform over the next few days.

Tony


>>> Jeff Dike <jd...@ad...> 06/16/05 09:07AM >>>
I'd like to call attention to some recent patches that may be of interest
to people before they hit mainline.  These are all on my incremental =
patches
page, http://user-mode-linux.sf.net/patches.html=20

First, sched-starve (http://user-mode-linux.sourceforge.net/work/current/2.=
6/2.6.12-rc6-mm1/patches/sched-starve)

This fixes a timer initialization botch which resulted in soft lockup
warnings in recent kernels, total non-responsiveness (i.e. nothing
else would be scheduled) under any workload which avoided idling the
kernel, and may be responsible for the load average >=3D 1 problem.

I don't see that last here for some reason, so I'd like some
confirmation (or not) that this patch fixes that.

Second, I implemented soft interrupts, which reimplements interrupt
enabling and disabling with a flag rather than with sigprocmask.  This
cuts down hugely on the number of system calls that UML makes,
resulting in a very noticable performance increase.  This patch, plus
the other system call reducing patches which immediately follow it,
speed up my kernel builds by 20-25%.  By far the largest piece of this
is softints, although skas-no-flush-kernel also is noticable.

I'd like people to check out softints, at least, and report any
problems.  It's running fine here, but interrupt handling is a
sensitive area, so I'd like to know people are running it without
problems before pushing it to mainline.

				Jeff


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