Robert, that really sounds like good news. To answer the question what exactly improved things could get a bit difficult. It also depends a bit what exactly the last stock ec2 kernel was you are comparing against. I had been doing a first round of changes which Jeremy has been testing (from what he wrote I was assuming that the fork/clone issue was gone but still some process time accounting going wrong). With this second, bigger round of changes, there were changes to the interrupt handling and also some timer, and accounting changes which could have have an effect. But also quite a bit more. If you want to look at the changes yourself, I try to keep the delta up to date as long as it is not in the stock kernel at "git://kernel.ubuntu.com/smb/ubuntu-lucid.git ec2-next". The reason this quite big is a bit of a long story. In short the ec2 code is based on a patch-set that is rebased. And we don't know exactly against what. So individual patches can change without proper explanation why. I tried to document things as much as I was able, still it is not always nice.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. https://bugs.launchpad.net/bugs/708920 Title: Strange 'fork/clone' blocking behavior under high cpu usage on EC2 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
