Hi Roman, Interesting capture file! Thanks for posting it to the forum so we can all take a look.
I'm looking at the capture file with WireShark v1.0.4 (a little old now). Applying display filter 'ip.src == 10.24.1.29' to just see what the Windows Server is sending. There are fifteen Read(16), and a couple of Write(16). At packet #586 we see a 'SCSI Write(16)' with a length of 16 blocks. That's 16*512 = 8192 bytes. WireShark is showing the size of that Ethernet packet as 8294 bytes. That seems quite large. At packet #795 we see a 'SCSI Write(16)' with a length of 128 blocks. That's 128*512 = 65536 bytes. WireShark is showing the size of that Ethernet packet as 62834 bytes. That seems like a very large packet! It's unclear how 65536 bytes of data fit into a 62834 byte packet! It appears to be truncating the data! What happens if OpenSolaris is expecting 65536 bytes, but actually receives less than that...? I've never before seen a capture file that shows such large size packets. Are you using super jumbo frames from the Windows Server? Filtering with ''ip.src == 10.24.1.101' you see the maximum size Ethernet packet that OpenSolaris is transmitting is 1514 byte, which is normal. >From OpenSolaris, the largest TCP window we see advertised is 64240 bytes. As you've not capture the initial SYN, SYN+ACK handshake, it's unclear if TCP window scaling has been negotiated. On the OpenSolaris box, between packets #833 and #856 the TCP window reduces from 64048 down to 1268 and then remains at that value. To me the capture file seem to show that the Windows server is dropping a big load of data, in one gulp, into the mouth of the OpenSolaris server, and it's too much in one go. There may be other issues, but I think that needs to be resolved first. I make no claim to be an expert on this, and I'm just trying to spot the facts and draw the conclusions. So hopefully someone who is an expert can enlighten us all. Best Regards Nigel Smith -- This message posted from opensolaris.org _______________________________________________ storage-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/storage-discuss
