[Phoronix] Ubuntu 9.04 vs. Fedora 11 Performance

Jeff Spaleta jspaleta at gmail.com
Thu Jun 11 17:43:42 UTC 2009


On Thu, Jun 11, 2009 at 9:26 AM, Xose Vazquez
Perez<xose.vazquez at gmail.com> wrote:
> hi,
>
> In Apache Benchmark:
> "Ubuntu was able to sustain more than 58% more requests per second than Fedora 11"
>
> <http://www.phoronix.com/scan.php?page=article&item=fedora11_ubuntu904_perf&num=2>

Why did you cherry pick the bad news instead of the summary?

"In a number of the benchmarks the results were close, but in a few
areas there are some major performance differences. In particular,
with the test profiles that stress the system disk, Fedora 11
generally did much better -- in part due to the EXT4 file-system and
newer Linux kernel. Fedora also did much better with the database
tests like SQLite and PostgreSQL. Ubuntu 9.04 though had done a better
job with the Apache Benchmark and C-Ray."

The disk i/o related tests on the later pages of the multiple page
article look really good.  And its sort of expected with the move to
ext4 in F11 as a default filesystem.  We did expect a disk i/o
performance for ext4 right? It would be easy to confirm ext4 as a
leading factor that by rerunning the same disk i/o and database tests
on an Ubuntu system configured to use ext4.

The question becomes what is significantly different in the Apache
test? Is the Apache test essentially a network i/o test? What is
significantly different here that would not end up being tracked to an
upstream kernel networking stack regression? Is the apache performance
collatoral damage from selinux related latency?    Something else in
userspace slowing Apache down. I've no idea.   I can't imagine its
compiler related options on the Apache binaries.

-jef




More information about the devel mailing list