Memory allocation performance/statistics patches
rwatson at FreeBSD.org
Sun Apr 17 10:49:15 PDT 2005
On Sun, 17 Apr 2005, Robert Watson wrote:
> I'd like to confirm that for the first two patches, for interesting
> workloads, performance generally improves, and that stability doesn't
> degrade. For the third partch, I'd like to quantify the cost of the
> changes for interesting workloads, and likewise confirm no loss of
Just an FYI on some earlier testing done by a couple of people:
- Bosko Milekic has reported that the UMA changes resulted in a
performance increase in his high bandwidth denial of service testing,
as well as a decreased occurence of livelock.
- Scott Long has reported that the UMA changes produced a performance
increase in MySQL testing. However, that the combined malloc + mbuf +
uma patches produced a slight decrease in performance. He has not yet
been able to try them split out to see if there's another factor at
work, or which elements are causing the problem.
- I've observed clear micro-benchmark improvements with the UMA cache in
place for high speed UDP packet generation in userland, as well as
syscall tests for the allocation/free of pipes and sockets.
Robert N M Watson
More information about the freebsd-performance