[Zope] Re: [Zope-dev] Slow FTP Downloads - Zope 2.6.4, 2.7

[Max M]

Edward Pollard wrote:

> Attempts to move to Zope 2.6.4 and 2.7 have been stymied, however, since 
> any servers we have set up with these versions of Zope refuse to allow 
> users to download via FTP faster than 10k/second. During these 
> downloads, the CPU shoots straight to 100%. While we can have 10 
> different connections active, they all go at 10k/sec and the CPU is 
> always at 100% regardless of how many connections we have. This is 
> across a variety of FTP clients, so we don't think that is related to 
> the issue.

I definitely think it is a problem somewhere in your setup. Not in Zope. 
In the olden days we had a saying "It can be anything". This still holds 
true.

I Just uploaded and downloaded a file via ftp.:

     14,175,113 bytes transferred in 00:00:02, 7,087,556 bytes/sec

That is on a 1 GHz machine with 512 MB ram. So basically Zope is fast 
enough. Others have confirmed this.

So I think you need to describe your setup very accurately. It could 
even be a hardware problem. Perhaps a network problem. Or more likely a 
software configuration problem.

When you download big files via. http, is that also only 10 KB/S?

When you are running an ftp client on the server directly to zopes ftp 
port (8082 or whatever) is it still as slow?

Do you proxy the ftp to port 21 through some software?

Any special router hardware/softare in front of the Zope server doing 
nat'ing?

etc. etc.


regards Max M