On Tue, 27 Sep 2011, Jason White wrote:
Chris Samuel <chris@csamuel.org> wrote:
I've seen the same, dropped back to 2.6.38 in Ubuntu after trying 3.0.x for a while to regain some sanity. Sigh..
I don't recall reading about any virtual memory changes in recent kernels.
There was an interesting LWN article on patches (not yet integrated, because not adeuqately tested) to improve page write-back performance significantly.
Someone affected by this really should push bug reports upstream.
Problem is, it's just 2% here and there. 2.6.38 is much worse than 2.6.26, but I can't boot the latter anymore. 2.6.26 is much worse than 2.6.8 which was much worse than 2.4.x. How do I submit benchmarks? "2.6.38 feels much slower than old kernels. But in the meantime, I upgraded opera, Xorg, and everything else. Please fix."? The current production internal webserver with 15million files and 146,000 directories rsyncs daily to our new machine. They're identical apart from OS and the old one actually having a load and being busy. The new machine can't allocate order-1 pages when backing up despite having 11.5 out of 12GB memory free. The old machine could. But it was redhat 4 and the new one is redhat 6. Naturally, we have a case open with redhat, but if you've ever had the misfortune of doing that yourself, you'll know how futile that is. -- Tim Connors