slow transfers on webshare service
000.fbsd at quip.cz
Tue Sep 18 11:09:36 PDT 2007
Ivan Voras wrote:
> Miroslav Valenta wrote:
>> 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"
>> 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
> 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
I am running Lighttpd for about 2 years on download server. With 1
worker, lighttpd seems limited to 110Mbps. After change to 4 workers
throughput increase to about 190Mbps serving 250-400 clients. (daily
traffic is ~750GB)
I am using these settings:
server.event-handler = "freebsd-kqueue" # needed on OS X
#server.network-backend = "freebsd-sendfile" # better for small files
server.network-backend = "writev" # better for large files?
server.max-keep-alive-requests = 6
server.max-keep-alive-idle = 5
server.max-read-idle = 60
server.max-write-idle = 180
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