[Samba] Speed/lockup problems with wireless client
Eric Ellsworth
whalesuit at bonbon.net
Wed Feb 5 18:34:00 GMT 2003
Hi,
I have samba running on a home LAN using a Linksys mixed wired (100 Mbit
ethernet) & wireless access point, which also does NAT to a DSL modem. The
server is connected to this access point via an ethernet cable. Clients can
connect via wireless or wired network connection.
I am using encrypted passwords, and have in smb.conf:
socket options = TCP_NODELAY SO_RCVBUF=4096 SO_SNDBUF=4096
IPTOS_LOWDELAY
When I connect to a share from the client, copying down from this share gets
so slow it locks the client - in Windows, the instance of Windows Explorer
locks, while in Linux under an xterm,
# cp /mnt/share/test/somefile.dat /home/me/test/somefile.dat
results in:
cp: reading `/mnt/share/test/somefile.dat': Input/output error
Copying up to server is no problem on either side, and copying up and down
are no problem when the client is connected to the networked by wired
connection.
When the share is public (i.e.:
comment = Some Dir
path = //somedir
read only = no
public = yes
printable = no
)
the client can copy up and down without problems
>From what I was able to scour off of mailing lists (mainly this one), problems
like this have something to do with timing differences between the client,
the smb daemon, and the server network card, but I have no idea where to
start fiddling to resolve this.
Can anyone give me ideas to help make copying up to the server not lock up
clients but still preserve passwords on shares?
Many, many thanks for any ideas,
Eric
Here's the output of tcpdump and netstat during a copy attempt
on Linux (which eventally failed):
# tcpdump -c 20
13:23:50.978082 192.168.1.10.ssh > 192.168.1.1.33122: P
671020557:671020621(64) ack 3921394066 win 8576 <nop,nop,timestamp 612682735
1520462> (DF) [tos 0x10]
13:23:50.978835 192.168.1.10.32798 > wdc.speakeasy.net.domain: 57812+ PTR?
10.1.168.192.in-addr.arpa. (43) (DF)
13:23:50.981379 192.168.1.1.33122 > 192.168.1.10.ssh: . ack 64 win 63712
<nop,nop,timestamp 1520462 612682735> (DF) [tos 0x10]
13:23:51.006595 wdc.speakeasy.net.domain > 192.168.1.10.32798: 57812
NXDomain* 0/0/0 (43) (DF)
13:23:51.006858 192.168.1.10.32798 > wdc.speakeasy.net.domain: 57813+ PTR?
1.1.168.192.in-addr.arpa. (42) (DF)
13:23:51.036112 wdc.speakeasy.net.domain > 192.168.1.10.32798: 57813
NXDomain* 0/0/0 (42) (DF)
13:23:51.036286 192.168.1.10.32798 > wdc.speakeasy.net.domain: 57814+ PTR?
2.159.92.66.in-addr.arpa. (42) (DF)
13:23:51.062309 wdc.speakeasy.net.domain > 192.168.1.10.32798: 57814 1/0/0
PTR[|domain] (DF)
13:23:51.259724 192.168.1.10.netbios-ssn > 192.168.1.101.33126: P
1203552341:1203553593(1252) ack 183206398 win 4665 <nop,nop,timestamp
612682880 1520345>NBT Packet (DF)
13:23:51.259826 192.168.1.10.32798 > wdc.speakeasy.net.domain: 57815+ PTR?
101.1.168.192.in-addr.arpa. (44) (DF)
13:23:51.267240 192.168.1.101.33126 > 192.168.1.10.netbios-ssn: P 1:145(144)
ack 1252 win 11584 <nop,nop,timestamp 1520491 612682880>NBT Packet (DF)
13:23:51.267479 192.168.1.10.netbios-ssn > 192.168.1.101.33126: P
1252:1338(86) ack 145 win 4665 <nop,nop,timestamp 612682883 1520491>NBT
Packet (DF)
13:23:51.270688 192.168.1.101.33126 > 192.168.1.10.netbios-ssn: P 145:194(49)
ack 1338 win 11584 <nop,nop,timestamp 1520491 612682883>NBT Packet (DF)
13:23:51.270761 192.168.1.10.netbios-ssn > 192.168.1.101.33126: .
1338:2786(1448) ack 194 win 4665 <nop,nop,timestamp 612682885 1520491>NBT
Packet (DF)
13:23:51.270769 192.168.1.10.netbios-ssn > 192.168.1.101.33126: .
2786:4234(1448) ack 194 win 4665 <nop,nop,timestamp 612682885 1520491>NBT
Packet (DF)
13:23:51.281006 192.168.1.101.33126 > 192.168.1.10.netbios-ssn: . ack 4234 win
11584 <nop,nop,timestamp 1520492 612682885> (DF)
13:23:51.281016 192.168.1.10.netbios-ssn > 192.168.1.101.33126: P
4234:5486(1252) ack 194 win 4665 <nop,nop,timestamp 612682890 1520492>NBT
Packet (DF)
13:23:51.288257 wdc.speakeasy.net.domain > 192.168.1.10.32798: 57815
NXDomain* 0/0/0 (44) (DF)
13:23:51.290590 192.168.1.101.33126 > 192.168.1.10.netbios-ssn: P 194:243(49)
ack 5486 win 11584 <nop,nop,timestamp 1520493 612682890>NBT Packet (DF)
13:23:51.290645 192.168.1.10.netbios-ssn > 192.168.1.101.33126: .
5486:6934(1448) ack 243 win 4665 <nop,nop,timestamp 612682895 1520493>NBT
Packet (DF)
------------------------------------------------------------------------------------------------------------------
# netstat
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 192.168.1.1:netbios-ssn 192.168.1.101:33126
ESTABLISHED
tcp 0 256 192.168.1.10:ssh 192.168.1.1:33122
ESTABLISHED
Active UNIX domain sockets (w/o servers)
Proto RefCnt Flags Type State I-Node Path
unix 7 [ ] DGRAM 988 /dev/log
unix 3 [ ] STREAM CONNECTED 202684
unix 3 [ ] STREAM CONNECTED 202683
unix 2 [ ] DGRAM 1775
unix 2 [ ] DGRAM 1683
unix 2 [ ] DGRAM 1273
unix 2 [ ] DGRAM 1065
unix 2 [ ] DGRAM 1001
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