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Old 02-04-2014, 02:46 PM   #1
badtlc
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Registered: Feb 2014
Posts: 27

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Newbie looking for networking help...


I have stumbled across something that is frustrating the heck out of me. Hopefully someone here can help. My network is as follows:

- 100 Mbps switch
- Cat 5e cabling

PC1:
- Linux Mint 16 64-bit Cinnamon
- Intel mobo w/ integrated 1Gbps ethernet
- Intel Core 2 Duo @ 2.3 Ghz
- 2 GB Ram
- 500 GB SATA2 HDD AHCI mode
- EXT4 partitions
- "data" folder shared via usershare

PC2:
- Windows 7 Home Premium 64-bit
- AMD Phenom II quad core @ 3.2 Ghz
- AMD motherboard with integrated Realtek 1Gbps ethernet
- 6 GB of RAM
- 2 TB SATA2 HDD AHCI Mode
- NTFS partitions
- "media" folder shared via windows file sharing with password protection (homegroup disabled)

Scenario 1:
I sit at PC1 which acts as a very basic data server for my home network. When I initiate transfers while sitting at this machine using NEMO it goes as follows:
- Copy a file from PC1 into "media" folder on PC2 (size doesn't matter). Sending speed is about 4.4 MB/s (40 Mbps or so).
- Copy a file from PC2 "media" folder to PC1 (size doesn't matter). Receiving speed is about 5.5 MB/s (50 Mbps or so).
- Using Firefox, downloading large files from PC2's simple HTTP server, transferring 1 file goes around 3.3 MB/s. Transferring 5 large files maxes out the connection at 11.2 MB/s.

Scenario 2:
I set at PC2 which is basically a client on my home network most of the time. When I initiate transfers while sitting at this machine using Windows Explorer it goes as follows:
- Copy a file from PC2 into "data" folder on PC1 (size doesn't matter). Sending speed is 11.2 MB/s (99.7 Mbps or so).
- Copy a file from PC1 "data" folder to PC2 (size doesnt matter). Receiving speed is 11.2 MB/s (99.7 Mbps or so).

Any transfer initiated from PC2 (win7) operates at the proper speed regardless of direction of transfer. Any transfer initiated from PC1 (Mint) goes MUCH slower regardless of direction of transfer. Does this make sense to anyone? Is there a way to get Mint to transfer as fast? I don't understand what would cause these differences.

I think this might be because of which OS calls out the TCP settings for the transfer. I have tried all sorts of TCP window size settings and just can't get this figured out.

Can anyone point me in the right direction?

Thanks.
 
Old 02-04-2014, 06:41 PM   #2
jefro
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Just for grins, can you get a cable between the two and take the router out of the deal for a test?
 
Old 02-04-2014, 09:51 PM   #3
frankbell
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Registered: Jan 2006
Location: Virginia, USA
Distribution: Slackware, Debian, Mint, OpenBSD
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To build on what Jefro said, I think that would need to be a crossover cable, not a standard cable, to connect the two computers directly.
 
Old 02-05-2014, 09:10 AM   #4
jpollard
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It might even work without a crossover cable...

Both systems are likely new enough to have network interfaces that will auto-negotiate. It does help if only one system auto-negotiates though.
 
Old 02-07-2014, 10:40 AM   #5
badtlc
LQ Newbie
 
Registered: Feb 2014
Posts: 27

Original Poster
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Can we merge this with my thread in the networking section? I first posted there but it never showed up for me for some reason and then when I posted this I now have two threads on the same subject.

I am sorry about this.

Here is the other thread where I will post follow ups.

http://www.linuxquestions.org/questi...29#post5110629
 
Old 02-07-2014, 08:39 PM   #6
frankbell
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Quote:
Can we merge this with my thread in the networking section?
Use the "Report" button to ask a moderator to help you with that.
 
  


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