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

[Vu Pham]

Sufficool, Stanley wrote:
> 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.
>
>   

I'll check it in with some other patches before the weekend
You should use ofed-1.3 (srpt is in there).

http://www.openfabrics.org/git/~vu/srpt.git is for older ofed version (ie. 1.2.5 and 1.2)


> 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!
>
>   

Kudo to Vlad - great job on scst, iscsi_scst...!

>
>
> 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.
>