[rabbitmq-discuss] Huge latency in Linux, compared with Leopard

Bogon Choi bogon.choi at gmail.com
Sat Sep 27 06:05:17 BST 2008

Thanks for your reply.
I tested the two scenarios on physically independent machines, one from my
iMAC and the other from other guy's DELL.
Let me ask you a quick question. If I have to tune the Linux's kernel, which
part should I check out first?
Can you give me some idea? Or, some link I can reference? I think I have to
check out the tcp stack of Linux first, e.g. checking out tcp buffer size or
mtu size, etc. Actually, I don't know the kernel tuning area. 

Anthony-108 wrote:
> Different platforms having different kernels and therefore different
> schedulers etc.
> Redhat's plugging a product at the moment which contains some realtime
> changes to the Linux kernel and a customised version of QPid all together
> called Redhat MRG. Apparently you can get portions of this for CentOS 5
> (RHEL 5 GPL clone)..
> Without wholesale changing to another AMQP platform (this is the RabbitMQ
> mailing list after all), perhaps you need to look at kernel options open
> to
> you? Remember, that Apple control the hardware and the software, and
> therefore have a lot better idea of what they have to do with respect to
> tuning their kernels. Linux must deal with a greater hardware variety and
> therefore "out of the box" may not be optimal for everyone.
> Incidentally, are you running the install of Linux on the same machine as
> Mac OS X?
> Ie. Native boot, such as Bootcamp and not a virtualisation solution of
> some
> sort
> Different hardware (various memory controllers, IO controllers, bridges
> yadda yadda) will return different results.
> (Disclaimer: Before using anything like bootcamp, you should have a backup
> strategy in place - any kind of repartitioning of an existing datastore
> has
> a risk associated)
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