Re: Throughput riddle
On 03/20/2016 07:10 PM, Celejar wrote:
Laptop:
RX packets:922215 errors:0 dropped:1967 overruns:0 frame:0
TX packets:1186319 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:724785210 (691.2 MiB) TX bytes:1311193642 (1.2 GiB)
NAS:
RX packets:509256 errors:0 dropped:3 overruns:0 frame:0
TX packets:234641 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:767110212 (731.5 MiB) TX bytes:16498728 (15.7 MiB)
Interrupt:87
Router (wireless interface):
RX packets:1474219 errors:0 dropped:0 overruns:0 frame:0
TX packets:1571154 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:994970603 (948.8 MiB) TX bytes:1544655324 (1.4 GiB)
Assuming:
1. The configuration is:
laptop - WiFi - router - Cat 5 - NAS
2. You did a cold boot on everything.
3. You ran iperf from the laptop to the NAS.
4. You ran iperf from the NAS to the laptop.
Ideas:
1. I assume the dropped RX statistic means that received packets were
malformed, and not that they were dropped by a firewall rule (?).
2. The laptop WiFi interface dropping 1967 packets while the router
WiFi interface dropping zero leads me to think there's a problem that
only affects the laptop receiver. Perhaps you need turn up the
transmitter power in the router (?).
3. I don't understand why the NAS dropped 3 packets. A wired
connection should drop zero. Maybe it's the Cat 5 cable. Perhaps you
need a Cat 5E.
4. The laptop TX bytes (1.2 GiB) and NAS RX bytes (731.5 MiB) do not
correlate well.
5. The NAS TX bytes (15.7 MiB) and laptop RX bytes (691.2 MiB) do not
correlate well.
6. Information for the router wired interface is missing.
Please try another run per my assumptions, above. Revise and re-post
assumptions as necessary. Post new ifconfig, iwconfig, dmesg, and
anything else that looks like a clue.
David
Reply to: