[ros-users] image transport saturating network

[Blaise Gassend]

Well, you defnitely do have some long packets in there, so the steps I
described before could help. Can you get error counts from your wireless
interface?

On Fri, 2010-04-09 at 16:06 -0500, Dan Lazewatsky wrote:
> Here's some more:
> 
> 16:03:05.393873 00:16:44:c6:4f:f4 (oui Unknown) > 00:26:08:e9:8a:bc (oui 
> Unknown), ethertype IPv4 (0x0800), length 1514: 
> toil.robots.cse.wustl.edu.53552 > 192.168.1.115.49680: . 
> 1130888:1132336(1448) ack 1 win 108 <nop,nop,timestamp 5842447 497191153>
> 16:03:05.393892 00:26:08:e9:8a:bc (oui Unknown) > 00:16:44:c6:4f:f4 (oui 
> Unknown), ethertype IPv4 (0x0800), length 66: 192.168.1.115.49680 > 
> toil.robots.cse.wustl.edu.53552: . ack 1133784 win 65535 
> <nop,nop,timestamp 497191169 5842447>
> 16:03:05.394168 00:16:44:c6:4f:f4 (oui Unknown) > 00:26:08:e9:8a:bc (oui 
> Unknown), ethertype IPv4 (0x0800), length 1514: 
> toil.robots.cse.wustl.edu.53552 > 192.168.1.115.49680: . 
> 1132336:1133784(1448) ack 1 win 108 <nop,nop,timestamp 5842456 497191153>
> 16:03:05.394182 00:26:08:e9:8a:bc (oui Unknown) > 00:16:44:c6:4f:f4 (oui 
> Unknown), ethertype IPv4 (0x0800), length 66: 192.168.1.115.49680 > 
> toil.robots.cse.wustl.edu.53552: . ack 1133784 win 65535 
> <nop,nop,timestamp 497191169 5842456>
> 16:03:05.394233 00:26:08:e9:8a:bc (oui Unknown) > 00:16:44:c6:4f:f4 (oui 
> Unknown), ethertype IPv4 (0x0800), length 66: 192.168.1.115.49680 > 
> toil.robots.cse.wustl.edu.53552: . ack 1129440 win 65535 
> <nop,nop,timestamp 497191168 5842437>
> 16:03:05.394353 00:26:08:e9:8a:bc (oui Unknown) > 00:16:44:c6:4f:f4 (oui 
> Unknown), ethertype IPv4 (0x0800), length 66: 192.168.1.115.62595 > 
> toil.robots.cse.wustl.edu.ssh: . ack 752 win 33304 <nop,nop,timestamp 
> 497191168 5842439>
> 16:03:05.394458 00:26:08:e9:8a:bc (oui Unknown) > 00:16:44:c6:4f:f4 (oui 
> Unknown), ethertype IPv4 (0x0800), length 66: 192.168.1.115.49680 > 
> toil.robots.cse.wustl.edu.53552: . ack 1130888 win 65535 
> <nop,nop,timestamp 497191168 5842447>
> 16:03:05.394563 00:26:08:e9:8a:bc (oui Unknown) > 00:16:44:c6:4f:f4 (oui 
> Unknown), ethertype IPv4 (0x0800), length 66: 192.168.1.115.49680 > 
> toil.robots.cse.wustl.edu.53552: . ack 1133784 win 65535 
> <nop,nop,timestamp 497191169 5842447>
> 16:03:05.395265 00:26:08:e9:8a:bc (oui Unknown) > 00:16:44:c6:4f:f4 (oui 
> Unknown), ethertype IPv4 (0x0800), length 98: 192.168.1.115 > 
> toil.robots.cse.wustl.edu: ICMP echo request, id 12823, seq 5952, length 64
> 
> -Dan
> 
> On 4/9/10 3:56 PM, Blaise Gassend wrote:
> >> The man file isn't particularly useful for figuring out how what the
> >> output means, so here is a few lines:
> >>
> >> 15:04:57.045705 IP toil.robots.cse.wustl.edu.53552>
> >> 192.168.1.115.49680: . 931064:932512(1448) ack 1 win 108
> >> <nop,nop,timestamp 4970372 497156321>
> >> 15:04:57.045710 IP 192.168.1.115.49680>
> >> toil.robots.cse.wustl.edu.53552: . ack 931064 win 33304
> >> <nop,nop,timestamp 497156335 4970352>
> >> 15:04:57.045711 IP 192.168.1.1.http>  192.168.1.115.49706: P 1:351(350)
> >> ack 597 win 6556<nop,nop,timestamp 172066583 497156334>
> >> 15:04:57.045777 IP 192.168.1.115.49680>
> >> toil.robots.cse.wustl.edu.53552: . ack 933960 win 33304
> >> <nop,nop,timestamp 497156335 4970372>
> >> 15:04:57.045809 IP 192.168.1.115.49706>  192.168.1.1.http: . ack 351 win
> >> 33129<nop,nop,timestamp 497156335 172066583>
> >>      
> >>> Have you tried using compressed image transports?
> >>>        
> > Strange, I have never seen tcpdump not print packet lengths. Try adding
> > -e.
> >
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