I've ran out of ideas

CHOI Junho cjh at kr.FreeBSD.org
Thu Nov 18 03:02:49 PST 2004

Can you test it on 4.x machines? I think 5.x is not stable/optimized
for kqueue operations of thttpd.

If you have sufficient(not swapping) memory, you can do 100Mbps/sec
easily, as long as on 4.x.

And, check several sysctls: somaxconn, mbuf, and polling.

From: Aaron Glenn <aaron.glenn at gmail.com>
Subject: I've ran out of ideas
Date: Thu, 18 Nov 2004 01:47:17 -0800

> I'm pushing large files via thttpd over low-end hardware (celeron
> 1.8GHz, 512MB RAM, UATA 100 drive) and, out of the box, FreeBSD
> 5.3-RELEASE topped out at 40Mbps sustained. After creating a separate
> partition with a much larger blocksize, it's hit 50Mbps sustained but
> won't go past 54Mbps at all.
> iostat shows the drive pushing 3.5MB/s pretty consistently. There are
> on average 750 http connections. Interrupts take 12% of the CPU,
> according to top, and another 2% for thttpd itself. The box doesn't
> swap.
> My dmesg is inexplicably gone...which I realize is going to seriously
> hamper any constructive input. It is an fxp card, and the IDE
> controller is a generic Intel controller (the motherboard is an old
> gateway desktop pull). The /var/log/messages file is filled with:
> Nov 18 04:00:15 d thttpd[38743]: write - Socket is not connected
> sending /path/to/file.name
> I'd like to know what else I can to do maximize raw network I/O. I
> don't see why this box can't push 90Mbps. My good friend, colleague,
> and Linux zealot, is eating this up. (-:
> Regards,
> aaron.glenn
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CHOI Junho <http://www.kr.FreeBSD.org/~cjh>     cjh@[kr.]FreeBSD.org
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