Date: Tue, 18 Sep 2007 19:52:26 +0200 From: Miroslav Lachman <000.fbsd@quip.cz> To: Ivan Voras <ivoras@freebsd.org> Cc: freebsd-fs@freebsd.org Subject: Re: slow transfers on webshare service Message-ID: <46F0105A.3060309@quip.cz> In-Reply-To: <fclmc2$bed$1@sea.gmane.org> References: <1189978356.30388.11.camel@afrodita> <fclmc2$bed$1@sea.gmane.org>
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Ivan Voras wrote: > 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? 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 Miroslav Lachman
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