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Slow file transfers

 
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jisis
PostPosted: Mon Oct 20, 2008 11:10 pm    Post subject: Slow file transfers Reply with quote

Howdy,

pc1:Blag, wi-fi(54Mb/s), 1gb,1.8Ghz core2duo
pc2: Blag, ethernet, 1gb, 2,4Ghz

Copying files from pc1 > pc2 on home network is slower than I hoped for. I would expect to get at least 20Mb/s with wi-fi involved . Current max. speeds for pc1 > pc2 copies as follows:

SCP: 400-500KB/s
samba:1MB/s
FTP:1MB/s

Downloading via internet on pc2 achieves 2MB/s, which is the limit of the internet connection, but neverthless double the best network speed.

Not done much testing, but I am able to FTP from pc1 > xbox(xbmc) at around 20MB/s, which initially makes pc2 look like the trouble maker..

gr00ve
PostPosted: Tue Oct 21, 2008 12:34 pm    Post subject: Reply with quote

I get around 5 to 6 MB/s ftp transfers off a server running blag on a wired 100mbit connection.
I'm guessing that besides such obvious factors as local firewall and local dns server network card driver is the bottleneck, but I am perhaps wrong.

one other thing to watch out for is if in ifconfig's output you start seeing errors for the interfaces - my experience was that in such case the card or the cable between the two is a bust. not 100% sure if this applies to wireless, as you can get errors logged there for reasons other then a bad card.

Which cards & drivers do you use?

john maclean
PostPosted: Sat Oct 25, 2008 4:20 am    Post subject: Reply with quote

Code:
 mii-tool
eth0: negotiated 100baseTx-FD, link ok

What do you get?


_________________
BLAG 'em up!
jisis
PostPosted: Sat Oct 25, 2008 10:57 am    Post subject: Reply with quote

it's Intel IWL3945.

This issue on hold as have wounded 2nd machine (see LVM thread).

ta

john maclean
PostPosted: Sun Oct 26, 2008 11:09 am    Post subject: Reply with quote

I know that you are dealing with the lvm issue on the other thread but..
Code:
 mii-tool
eth0: no autonegotiation, 10baseT-HD, link ok

Note the different speeds. The results show different speeds 'cos I was in an office with a "supa-doopa link", whist the latter shows my connection at home. They both show "link ok" though.


_________________
BLAG 'em up!
kazim
PostPosted: Sun Oct 26, 2008 11:36 am    Post subject: Reply with quote

Heya. Networking may not be the issue if the interface used in the internet download test is the same one used for pc1>pc2 test, I would look at disk controller / driver or hardware.

FYI: mii-tool don't work on wireless , use the ethtool command instead.

Code:
 
[root@eff w_scan-20080105]# ethtool eth1
Settings for eth1:
   Supported ports: [ TP ]
   Supported link modes:   10baseT/Half 10baseT/Full
                           100baseT/Half 100baseT/Full
                           1000baseT/Full
   Supports auto-negotiation: Yes
   Advertised link modes:  10baseT/Half 10baseT/Full
                           100baseT/Half 100baseT/Full
                           1000baseT/Full
   Advertised auto-negotiation: Yes
   Speed: 1000Mb/s
   Duplex: Full
   Port: Twisted Pair
   PHYAD: 1
   Transceiver: internal
   Auto-negotiation: on
   Supports Wake-on: pumbag
   Wake-on: g
   Current message level: 0x00000001 (1)
   Link detected: yes


Code:

[root@eff w_scan-20080105]# ifconfig eth0 |tail -n 6
          RX packets:1180670 errors:0 dropped:0 overruns:0 frame:0
          TX packets:815569 errors:152 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1344892055 (1.2 GiB)  TX bytes:116989431 (111.5 MiB)
          Interrupt:3 Base address:0x9100

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