David Lang wrote:
On Thu, 13 Apr 2006, Jeff V. Merkey wrote:
Note they ran the benchmark on an Opteron 285 instead of a Xeon with
16 GB of memory. Opteron peformance currently **SUCKS** with 2.6
series kernels under any kind of heavy I/O due to their cloning of
the ancient 82489DX architecture for I/O interrupt access and
performance. Looks like the test was stakced against Linux from the
start. Should have used a Xeon system. AMD needs to get their crappy
I/O performance up to snuff. Looking at the test parameteres leads me
to believe there was a lot of swapping on a system with already poor
I/O performance.
Jeff, I've seen several reccomendations from databasefolks (postgres
and mysql) favoring Opterons over Xeons. this doesn't match your
statement that Opteron performance sucks under any kind of I/O load. I
don't understand how both can be correct.
David Lang
Hi David,
I have tested our Solera products on both Xeon and Opteron Processors. I
can sustain 500 MB/S capture off the wire on 4 x 1000 Gigabit segments
due to the incredible performance of Xeon based I/O chipsets. My tests
with Opteron based systems are sick in comparison. An Opteron 200 series
CPU on a Tyan based motherbord system is discouraging on comparison. The
Opteron systems will only sustain 150 MB/S with the same software.
The I/O chipset performance for disk and LAN I/O is purtrid compared to
the 7500 series I/O chipsets.
Jeff
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