FTP send slow

Hi Folks,

I own a Via Epia Board with 500MHz CPU and have installed Linux from
Scratch with vsftp.

I started some benchmark with a 100MB file.

connection from local machine with ncftp (three times average):
get -> 6MB/s
send -> 4MB/s

I wonder why send is slower...in both cases the file is read and write
from/to harddisk, but this is not the main problem.

I also test ftp from a WinXP client (wsftp, 100Mbit LAN) :
get -> 6MB/s
send -> 200kB/s

After analysis I found out that there are many dropped packages in RX
from eth0. To solve this issue I set the window size from default to
1024. If I set this higher than I get dropped ones.
But this helps me to archive a send from 2MB/s.

This is less than I expect.
The VIA system is more or less idle when receiving the 100MB file. So
the CPU speed is not the brake here....

Does anybody know if the Onboard LAN of VIA Epia is that worse ?

Best Regards
ka-long

(E-Mail Removed) wrote:
> Hi Folks,
>
> I own a Via Epia Board with 500MHz CPU and have installed Linux from
> Scratch with vsftp.
>
> I started some benchmark with a 100MB file.
>
> connection from local machine with ncftp (three times average):
> get -> 6MB/s
> send -> 4MB/s
>
> I wonder why send is slower...in both cases the file is read and write
> from/to harddisk, but this is not the main problem.
>
> I also test ftp from a WinXP client (wsftp, 100Mbit LAN) :
> get -> 6MB/s
> send -> 200kB/s
>
> After analysis I found out that there are many dropped packages in RX
> from eth0. To solve this issue I set the window size from default to
> 1024. If I set this higher than I get dropped ones.
> But this helps me to archive a send from 2MB/s.
>
> This is less than I expect.
> The VIA system is more or less idle when receiving the 100MB file. So
> the CPU speed is not the brake here....
>
> Does anybody know if the Onboard LAN of VIA Epia is that worse ?

I does not measure the speed but had the same feeling with an 800MHz
epia board. It seems to me that the ethernet hardware is slow, or if
packets have been dropped, worse, low quality.

BR
Hans-Juergen Lange

(E-Mail Removed) wrote:
> Hi Folks,
>
> I own a Via Epia Board with 500MHz CPU and have installed Linux from
> Scratch with vsftp.
>
> I also test ftp from a WinXP client (wsftp, 100Mbit LAN) :
> get -> 6MB/s
> send -> 200kB/s
>
> After analysis I found out that there are many dropped packages in RX
> from eth0. To solve this issue I set the window size from default to


Did you check the Duplex settings?
Maybe give a try at mii-tools to check they are correct?

Hi,

> Did you check the Duplex settings?
> Maybe give a try at mii-tools to check they are correct?

The (FULL-)Duplex settings are OK.

But could you explain how duplex settings only affect the receiver side
of the server ?


Bye
ka-long