On May 14, 2012, at 12:21 AM, vansi wow wrote:

> Hi All,
>          we have ported SCTP from FreeBSD 7.0 tree  , but we face the
Hi Vamshi,

I would recommend to use more recent sources... There has been a huge
number of bug fixes been committed. BTW: What exactly does "porting"
mean? What system are you using?
> 
> issue that when we measure the throughput performance of the stack , we see
> that  SCTP throughput is half that of the TCP throughput .
> 
> Is there some tuning which can be done or some tweaks which can help
> improve the performance .

> 
> 
> 
> TCP :
> =====
> SO_SNDBUF = 32768
> SO_RCVBUF = 32768
> Throughput: 5653KB/s
> 
> 
> SCTP:
> ======
> SNDBUF = 838860
> RCVBUF = 838860
> Throughput = 2422 KB/s
Without any another information it is hard to say what is limiting the transfer.
Do you have any packet loss? What is the CPU load when doing the transfer?
FreeBSD 7 does not support CRC offloading...

Best regards
Michael
> 
> Regards,
> Vamshi
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