some numbers

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some numbers

by u+codalist-wk5r :: Rate this Message:

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Hello,

for information and for what it is worth,

a single Coda server here is talking to about 400 clients over a fast LAN,
each of them fetching about 120 MB at a random point in time during one hour.

The server seems to be processor-bound, presumably by the encryption,
the processor load stays near 100% and the corresponding peak performance
is slightly over 15 MB/sec out.

The computer is a double Dual Core AMD Opteron(tm) Processor 280 @2.4GHz
on a 1Gbit link.
The codasrv process is using one of the cores (due to the user space lwp).

Regards,
Rune


Re: some numbers

by u+codalist-wk5r :: Rate this Message:

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Replying to myself.

On Wed, Aug 13, 2008 at 03:27:29PM +0200, u+codalist-wk5r@... wrote:
> The server seems to be processor-bound, presumably by the encryption,
> the processor load stays near 100% and the corresponding peak performance
> is slightly over 15 MB/sec out.

This may look like I am complaining about encryption sinking the performance,
in fact not at all. I strongly prefer having the traffic encrypted
and appreciate the fact that I do not have to choose between different
protection modes.
That would just create extra complexity and a place for making errors.

Had we needed even better fetch performance here, we would set up several
replicating servers. The reading performance on the clients is normally
not bound by the network transfer speed, as soon as the clients use
the cached data more than once.

Cheers,
Rune