[Samba] Very slow transfers to Samba on Ubuntu

[Raghu A]

Sample tcpdump for such a connection : Notice that there are only couple of
1KB chunks for each millisecond : 

18:50:57.948157 IP 192.168.0.100.4366 > 192.168.0.104.445: P 2184:3276(1092)
ack 103 win 64719
18:50:57.948374 IP 192.168.0.104.445 > 192.168.0.100.4366: P 103:154(51) ack
3276 win 65535
18:50:57.948897 IP 192.168.0.100.4366 > 192.168.0.104.445: P 3276:4368(1092)
ack 154 win 64668
18:50:57.949074 IP 192.168.0.104.445 > 192.168.0.100.4366: P 154:205(51) ack
4368 win 65535
18:50:57.949615 IP 192.168.0.100.4366 > 192.168.0.104.445: P 4368:5460(1092)
ack 205 win 64617
18:50:57.949831 IP 192.168.0.104.445 > 192.168.0.100.4366: P 205:256(51) ack
5460 win 65535
18:50:57.950437 IP 192.168.0.100.4366 > 192.168.0.104.445: P 5460:6552(1092)
ack 256 win 64566
18:50:57.950649 IP 192.168.0.104.445 > 192.168.0.100.4366: P 256:307(51) ack
6552 win 65535
18:50:57.951152 IP 192.168.0.100.4366 > 192.168.0.104.445: P 6552:7644(1092)
ack 307 win 64515
18:50:57.951389 IP 192.168.0.104.445 > 192.168.0.100.4366: P 307:358(51) ack
7644 win 65535
18:50:57.951911 IP 192.168.0.100.4366 > 192.168.0.104.445: P 7644:8736(1092)
ack 358 win 64464
18:50:57.952090 IP 192.168.0.104.445 > 192.168.0.100.4366: P 358:409(51) ack
8736 win 65535
18:50:57.952608 IP 192.168.0.100.4366 > 192.168.0.104.445: P 8736:9828(1092)
ack 409 win 64413
18:50:57.952801 IP 192.168.0.104.445 > 192.168.0.100.4366: P 409:460(51) ack
9828 win 65535
18:50:57.953299 IP 192.168.0.100.4366 > 192.168.0.104.445: P
9828:10920(1092) ack 460 win 64362
18:50:57.953489 IP 192.168.0.104.445 > 192.168.0.100.4366: P 460:511(51) ack
10920 win 65535
18:50:57.954038 IP 192.168.0.100.4366 > 192.168.0.104.445: P
10920:12012(1092) ack 511 win 64311
18:50:57.954286 IP 192.168.0.104.445 > 192.168.0.100.4366: P 511:562(51) ack
12012 win 65535
18:50:57.954794 IP 192.168.0.100.4366 > 192.168.0.104.445: P
12012:13104(1092) ack 562 win 65535
18:50:57.954982 IP 192.168.0.104.445 > 192.168.0.100.4366: P 562:613(51) ack
13104 win 65535
18:50:57.955531 IP 192.168.0.100.4366 > 192.168.0.104.445: P
13104:14196(1092) ack 613 win 65484
18:50:57.955702 IP 192.168.0.104.445 > 192.168.0.100.4366: P 613:664(51) ack
14196 win 65535
18:50:57.956207 IP 192.168.0.100.4366 > 192.168.0.104.445: P
14196:15288(1092) ack 664 win 65433
18:50:57.956497 IP 192.168.0.104.445 > 192.168.0.100.4366: P 664:715(51) ack
15288 win 65535
18:50:57.956984 IP 192.168.0.100.4366 > 192.168.0.104.445: P
15288:16380(1092) ack 715 win 65382
18:50:57.957213 IP 192.168.0.104.445 > 192.168.0.100.4366: P 715:766(51) ack
16380 win 65535
18:50:57.957765 IP 192.168.0.100.4366 > 192.168.0.104.445: P
16380:17472(1092) ack 766 win 65331
18:50:57.957963 IP 192.168.0.104.445 > 192.168.0.100.4366: P 766:817(51) ack
17472 win 65535
18:50:57.958462 IP 192.168.0.100.4366 > 192.168.0.104.445: P
17472:18564(1092) ack 817 win 65280
18:50:57.958658 IP 192.168.0.104.445 > 192.168.0.100.4366: P 817:868(51) ack
18564 win 65535
18:50:57.959198 IP 192.168.0.100.4366 > 192.168.0.104.445: P
18564:19656(1092) ack 868 win 65229
18:50:57.959367 IP 192.168.0.104.445 > 192.168.0.100.4366: P 868:919(51) ack
19656 win 65535
18:50:57.959880 IP 192.168.0.100.4366 > 192.168.0.104.445: P
19656:20748(1092) ack 919 win 65178




Raghu A wrote:
> 
> I mounted a samba volume on XP. XP and Ubuntu are connected over 100Mbps
> ethernet (router).
> 
> I am writing a 4GB file from XP to Ubuntu and the transfer is extremely
> slow : only around 1-1.5 MB/s.
> 
> This is not a network or disk issue since at the same time this transfer
> is gonig on, I can scp the same file from XP to Ubuntu at 3-4 times faster
> (around 6MB/s).
> 
> What could be wrong? Even for this slow transfer, smbd seems to be taking
> quite a bit CPU (more than sshd for the transfer rate).
> 
> 

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