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Ethernet Throughput

D

Deiz

n00b
Joined
Apr 2, 2007
Messages
21
Hi, I've been migrating files from my laptop to my desktop today, via crossover.

The desktop supports gigabit ethernet, but the laptop NIC is only capable of 100 megabit speeds - I believe it's a Broadcom BCM4401.

However, monitoring my LAN activity using Firestarter, I only see speeds between 5000 and 6000 kB/s. Averaging close to 5500 kB/s throughout larger transfers.

5000 kB/s being 40 Mbit, 6000 kB/s being 48 Mbit, and 5500 kB/s being 44 Mbit... does this mean the laptop's NIC is half-duplex, and the rest of the transfer speed is used as overhead?
 
Try copying a bunch of files at one time (different transfers), you'll may see more of it being used at that point.
 
Well, depending on what hard drive is in the laptop, you may be disk limited in this situation.
 
You might also try zipping your transfers (just archive, no compression), then try. You might also want to look into a different protocol. I do not know what you are using, but in my experience, especially for large files, FTP blows away just about anything else for sheer throughput.
 
I've been transferring via Samba - And my test files have been a few of my newly-ripped albums (In FLAC).

I achieved around 6300 kB/s while transferring to one of my desktops that operates at 100Mbit, and tried the laptop again afterwards with numerous separate, but simultaneously-running transfers and achieved throughput averaging 8000 kB/s.

Is overhead really that great? (A third, or so, of total theoretical bandwidth.)

In any case, I'm currently building a second system that supports gigabit ethernet, so I'll be able to test gigabit throughput in a few days.
 
Deiz said:
Is overhead really that great? (A third, or so, of total theoretical bandwidth.)

In any case, I'm currently building a second system that supports gigabit ethernet, so I'll be able to test gigabit throughput in a few days.
Click to expand...

Overhead wont account for 60% of your bandwidth, you should be able to get 90Mbs or ~12MBs.
 
Might as well bring this one back as I've got a similar issue again.

I'm building a second system that supports gigabit ethernet, but for now, still, just the one box.

I set up vsftpd and placed a 1.1GB archive in the FTP folder, then downloaded it to the same drive, different folder via FileZilla, averaging around 30 MB/s. I got the exact same speed when downloading to a different drive, as well.

Using Firefox to browse the FTP and download offered around 25 MB/s average, a little slower than Filezilla.

All drives in this system are 7200.10, and seeing as the FTP is on localhost, I would think things should be substantially faster than this - Nothing is happening outside the PC, just internal drive-to-drive. (Yet 30MB/s is only 240 mbps.)

Any idea what's bottlenecking this?
 
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