Typical Network Performance
gull at gull.us
Sun Aug 1 22:03:51 UTC 2010
On Aug 1, 2010, at 2:18 PM, Jason C. Wells wrote:
> I have a 100 mbps (12,207 KiB/s) home LAN in full-duplex. A 1 MiB
> file transfers at 146.7 KiB/s via wput. The same file transfers at
> 91.34 KiB/s via samba. That's less than 1% of available transfer
> rate. Seems like my transfers are slow. I do better than that when
> installing via the internet.
> Does the FTP performance compared to available bandwidth seem
> right? Is the relative performance of samba to FTP right? I read a
> couple quick links on the net which said, "It's complicated."
Those figures do seem a little low. Some stuff to check:
Are transfers in one direction a lot faster than transfers in the
other? If so, the machines and the network switch may not all be
agreeing on the duplex mode. Auto-negotiation sometimes fails and can
lead to a lot of silent collisions, slowing things down dramatically.
How about the disk you're transferring from? Is it limiting the speed?
Those figures would be fairly normal for a USB 1.0 drive, for example.
Are you sure all the machines involved are operating at 100 mbps?
I've seen them silently fall back to 10 when there's a bad cable
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