[ofa-general] RE: [Scst-devel] [Stgt-devel] Performance of SCST versus STGT

[Sufficool, Stanley]

Can I surmise from all this benchmarking of the ib_srpt module that this
is now stable? Last I checked the git version still had a data
corruption bug.

I saw some patches submitted to fix this, but the OFED git repository
(http://www.openfabrics.org/git/~vu/srpt.git) shows no recent commits.

With all these impressive numbers, I am eager to see SRPT/SCST
performance in the WinOF srp initiator environment using database loads.

Props to Vu and Vlad for this outstanding storage transport!




On Jan 24, 2008 8:06 AM, Robin Humble <robin.humble+stgt at anu.edu.au>
wrote:
> On Tue, Jan 22, 2008 at 01:32:08PM +0100, Bart Van Assche wrote:
> >
>
>.......................................................................
......................
> >.                           .   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)  .
>
>.......................................................................
......................
> >. Ethernet (1 Gb/s network) .      77             78       .
77            89       .
> >. IPoIB    (8 Gb/s network) .     163            185       .
201           239       .
> >. iSER     (8 Gb/s network) .     250            N/A       .
360           N/A       .
> >. SRP      (8 Gb/s network) .     N/A            421       .
N/A           683       .
> >.....................................................................
> >.......................
>

Results with /dev/ram0 configured as backing store on the target
(buffered I/O):
                    Read          Write             Read          Write
                  performance   performance       performance
performance
                  (0.5K, MB/s)  (0.5K, MB/s)      (1 MB, MB/s)  (1 MB,
MB/s)
STGT + iSER           250          48                 349          781
SCST + SRP            411          66                 659          746

Results with /dev/ram0 configured as backing store on the target (direct
I/O):
                    Read          Write             Read          Write
                  performance   performance       performance
performance
                  (0.5K, MB/s)  (0.5K, MB/s)      (1 MB, MB/s)  (1 MB,
MB/s)
STGT + iSER             7.9         9.8               589          647
SCST + SRP             12.3         9.7               811          794

Bart.