Re: [Aoetools-discuss] AoE vs iSCSI

[Sam Hopkins <sah@xxxxxxxxxx>]

Hi Andrei,

> I've just make some performance tests copying files from my computer 
> remote PC running AOE and iSCSI. The results I've got are quite the same:
> 
...
> =====================================
> AOE /1Gb
> =====================================
> copying 1000 files of 1MB
> 
> real    0m53.117s
> user    0m0.164s
> sys     0m19.697s
>          1m13s

Don't add those values up as it doesn't make sense.  This reports that
in real time the test you ran took 53.1s.  Of that, .16s was spent in
user space and 19.6s was spent in the kernel.  To my understanding the
latter number is fuzzy as it gets incremented based on rules that can
change depending on your kernel version and how the kernel switches
tasks internally.

While this output is a good for getting a basic throughput number it's
not very good info for determining how much of your system is being
used.  A kernel process doing iscsi might not have its run time
attributed to the process you ran to perform the test.

As for comparing iscsi and aoe, your setup can make all the
difference.  What initiator and target are you using?  What hardware
(nics, cpu, memory, switches, cabling, etc)?  What tests are you using
to guage the throughput?  What filesystem?

I think we'd all be interested in any results you find, but the
context needs to be set appropriately.  Every detail matters.

Cheers,

Sam


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