Comment 1 for bug 503138

I've applied the attached patch to linux-image-2.6.31-16-generic and am running the patched kernel since late last night. I do see the hrtimer messages but with much lower values and even going down a few times (3375->1500 and 5062->3375):

[ 3304.175297] hrtimer: interrupt too slow, forcing clock min delta to 1500 ns
[ 3304.319296] hrtimer: interrupt too slow, forcing clock min delta to 2250 ns
[ 3662.181424] hrtimer: interrupt too slow, forcing clock min delta to 3375 ns
[ 3674.120250] hrtimer: interrupt too slow, forcing clock min delta to 1500 ns
[ 4967.256258] hrtimer: interrupt too slow, forcing clock min delta to 2250 ns
[ 5667.966180] hrtimer: interrupt too slow, forcing clock min delta to 5062 ns
[ 7238.413947] hrtimer: interrupt too slow, forcing clock min delta to 3375 ns
[ 9633.922211] hrtimer: interrupt too slow, forcing clock min delta to 5062 ns
[11509.242590] hrtimer: interrupt too slow, forcing clock min delta to 7593 ns
[17762.000426] hrtimer: interrupt too slow, forcing clock min delta to 7593 ns
[18016.880026] hrtimer: interrupt too slow, forcing clock min delta to 11389 ns

My system is now still very responsive, which never happened before after a night of rsync backup runs.

I'll keep it running for a couple of days and report back