Kostas,
I don't know the answer to your question but we will review our window sizes.
What kernel are you running BTW?
Regards
Andrew
> -----Original Message-----
> From: GRIDPP2: Deployment and support of SRM and local storage
> management [mailto:[log in to unmask]]On Behalf Of Kostas
> Georgiou
> Sent: 27 February 2006 19:03
> To: [log in to unmask]
> Subject: RAL and tcp window scale
>
>
> Hi,
>
> Is there any reason why connections from RAL use a small
> window scale? It isn't a huge problem since
> we download more than one file at a time (at ~400Mbit/sec
> which isn't bad).
>
> Cheers,
> Kostas
>
> # tcpdump "(tcp[13] & 2 == 2) and net 130.246.0.0/16"
> 17:57:53.086195 IP csfnfs63.rl.ac.uk.37119 >
> sedsk01.hep.ph.ic.ac.uk.20002: S 3803141749:3803141749(0) win
> 5840 <mss 1460,sackOK,timestamp 63679710 0,nop,wscale 0>
> 17:57:53.086217 IP sedsk01.hep.ph.ic.ac.uk.20002 >
> csfnfs63.rl.ac.uk.37119: S 2090337614:2090337614(0) ack
> 3803141750 win 5792 <mss 1460,sackOK,timestamp 2005209038
> 63679710,nop,wscale 7>
> 17:58:01.461084 IP csfnfs56.rl.ac.uk.47468 >
> sedsk01.hep.ph.ic.ac.uk.20003: S 1463167998:1463167998(0) win
> 5840 <mss 1460,sackOK,timestamp 63590139 0,nop,wscale 0>
> 17:58:01.461105 IP sedsk01.hep.ph.ic.ac.uk.20003 >
> csfnfs56.rl.ac.uk.47468: S 2102621349:2102621349(0) ack
> 1463167999 win 5792 <mss 1460,sackOK,timestamp 2005217413
> 63590139,nop,wscale 7>
> 17:58:06.836198 IP csfnfs63.rl.ac.uk.37125 >
> sedsk01.hep.ph.ic.ac.uk.20004: S 3822304021:3822304021(0) win
> 5840 <mss 1460,sackOK,timestamp 63681085 0,nop,wscale 0>
> 17:58:06.836218 IP sedsk01.hep.ph.ic.ac.uk.20004 >
> csfnfs63.rl.ac.uk.37125: S 2097080355:2097080355(0) ack
> 3822304022 win 5792 <mss 1460,sackOK,timestamp 2005222789
> 63681085,nop,wscale 7>
> 17:58:15.895498 IP csfnfs63.rl.ac.uk.37126 >
> sedsk01.hep.ph.ic.ac.uk.20005: S 3821909062:3821909062(0) win
> 5840 <mss 1460,sackOK,timestamp 63681991 0,nop,wscale 0>
> 17:58:15.895517 IP sedsk01.hep.ph.ic.ac.uk.20005 >
> csfnfs63.rl.ac.uk.37126: S 2116974896:2116974896(0) ack
> 3821909063 win 5792 <mss 1460,sackOK,timestamp 2005231849
> 63681991,nop,wscale 7>
> 18:00:03.720993 IP csfnfs62.rl.ac.uk.37456 >
> sedsk01.hep.ph.ic.ac.uk.20000: S 3965823440:3965823440(0) win
> 5840 <mss 1460,sackOK,timestamp 63676345 0,nop,wscale 0>
> 18:00:03.721028 IP sedsk01.hep.ph.ic.ac.uk.20000 >
> csfnfs62.rl.ac.uk.37456: S 2244495066:2244495066(0) ack
> 3965823441 win 5792 <mss 1460,sackOK,timestamp 2005339684
> 63676345,nop,wscale 7>
> 18:04:17.052536 IP csfnfs63.rl.ac.uk.37127 >
> sedsk01.hep.ph.ic.ac.uk.20001: S 4195422081:4195422081(0) win
> 5840 <mss 1460,sackOK,timestamp 63718110 0,nop,wscale 0>
> 18:04:17.052557 IP sedsk01.hep.ph.ic.ac.uk.20001 >
> csfnfs63.rl.ac.uk.37127: S 2490951319:2490951319(0) ack
> 4195422082 win 5792 <mss 1460,sackOK,timestamp 2005593037
> 63718110,nop,wscale 7>
>
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