On Tue, Jul 02, 2013 at 08:54:06PM -0400, Will Platnick wrote: > I am experiencing some issues with load after upgrading some of my Squeeze > boxes to Wheezy. I have 7 app servers, all with identical hardware with > identical packages and code. I upgraded one of my boxes to wheezy, along with > the custom packages we use for Python, PHP, etc… Same versions of the > software, just built on Wheezy instead of Squeeze. My problem is that my > Wheezy boxes have a load of over 3 and are not staying up during our peak > time, whereas our squeeze boxes have a load of less than 1. > The interesting part, is that despite the high load, my wheezy boxes are > actually performing quite well, and are outperforming my squeeze boxes by 2-3 > ms. Never the less, the high load is giving us cause for concern and is > stopping us from migrating completely, and we're wondering if anybody else is > seeing the same thing or can give us some assistance on where to go from here. > I believe I have tracked down the issue with our load to be an interrupt > issue. My interrupts on wheezy are way higher. CPU, I/O, Memory and Context > Switches are all the same (measured with top, atop, iotop, vmstat). It > doesn't appear to be a hardware issue, as I deployed wheezy and our code base > to a different and faster motherboard/cpu combo, and the issue remained. > The items that stands out is that my "Rescheduling Interrupts" and "timer" > are interrupting like crazy on wheezy compared to squeeze. Here is my output > of total interrupts on Squeeze vs Wheezy for two different machines, rebooted > and placed into service at the exact same time, with traffic distributed to > them via round robin, so it should be fairly equal. > Rescheduling Interrupts: 4109580 on Wheezy vs 67418 on Squeeze. > Timer: 504238 on Wheezy vs 50 on Squeeze. > > Thoughts? Suggestions?
This was the first search result for "Rescheduling Interrupts". The advice should apply to Debian equally well. https://help.ubuntu.com/community/ReschedulingInterrupts
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