slow transfers on webshare service

[Ivan Voras]

Miroslav Valenta wrote:
> Hi 
> 
> i have problem with slow transfers on my web filesharing server. I'm
> running FreeBSD 6.2 
> 
> files are sending by lighttpd 1.4.18 :
> 
> server.max-worker = 8
> server.max-fds = 8192
> server.network-backend = "writev"
> 
> -----
> 
> HW:
> xeon 3160 
> 4GB of RAM
> areca arc-1260 disk controller with 1GB cache + 8x 500GB sata2 hdd
> 
> 
> file transfers slow down when i'm about 500 downloading connections
> but when i send same file from same storage by same line it's  sending
> fast.

Please characterize "slow" and "fast" - how is it slow and how fast do 
you think it should be?

Some general tips/ideas:

- Do you really need 8 workers? Lighttpd is async server so it's about 
as fast as it gets. If you only serve static files, larger number of 
worker processes (and CPUs...) won't make a difference.
- Do you use the "kqueue" extension for Lighttpd?
- 500 parallel downloads probably mean lots of seeking on the disk drive 
array, have you verified you can sustain the speed you need with the drives?

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