Re: Integration of SCST in the mainstream Linux kernel

Roland Dreier
2008-01-29T21:32:21Z

> . . STGT read SCST read . STGT read SCST read .
> . . performance performance . performance performance .
> . . (0.5K, MB/s) (0.5K, MB/s) . (1 MB, MB/s) (1 MB, MB/s) .
> . iSER (8 Gb/s network) . 250 N/A . 360 N/A .
> . SRP (8 Gb/s network) . N/A 421 . N/A 683 .

> On the comparable figures, which only seem to be IPoIB they're showing a
> 13-18% variance, aren't they? Which isn't an incredible difference.

Maybe I'm all wet, but I think iSER vs. SRP should be roughly
comparable. The exact formatting of various messages etc. is
different but the data path using RDMA is pretty much identical. So
the big difference between STGT iSER and SCST SRP hints at some big
difference in the efficiency of the two implementations.

- R.