Date: Sat, 6 May 1995 11:37:22 +0800 (CST) From: Brian Tao <taob@gate.sinica.edu.tw> To: David Greenman <davidg@Root.COM> Cc: FREEBSD-QUESTIONS-L <freebsd-questions@FreeBSD.org> Subject: Re: Heavy HTTPD serving on 2.0-950412 Message-ID: <Pine.BSI.3.91.950506112626.7636D-100000@aries.ibms.sinica.edu.tw> In-Reply-To: <199505051840.LAA04219@corbin.Root.COM>
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On Fri, 5 May 1995, David Greenman wrote:
>
> options "NMBCLUSTERS=1024"
Yep, found it in the mail archives after John Fieber updated them
on the Web site.
> This will give you twice as many buffers (or 4 times if you don't have
> GATEWAY in your kernel). Double the above to 2048 if the problem
> persists. I use 8192 on wcarchive, which is enough for 1000 ftp users
> (about 2000 TCP connections).
Ah, my next two questions already answered. ;-) I ran an 11-hour
test with NCSA httpd 1.4 last night with 4 local Ethernet clients and
60 remote clients. No problems with NMBCLUSTERS set to 1024. Doing a
'netstat -n | grep ^tcp' showed between 450 and 520 open connections,
almost all in TIME_WAIT and nearly 16K in the send queue (not
surprisingly, all to sites across the Pacific). I haven't done the
analysis yet, but it looks like NCSA's preforking helps out a whole
lot here. I'm guessing about 600,000 accesses per day with a load
average of less than 1.00. :)
'systat -mbuf' shows this:
/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10
Load Average |
/0 /5 /10 /15 /20 /25 /30 /35 /40 /45 /50 /55 /60
pcbs XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 94
socknames XXXXXXXXXXXXXXXXXXX
data XXXXXX
headers XXXXX
Ummm... what should I be looking for, if I think I'm running out
of mbufs? Add up all the X's and see if they exceed NMBCLUSTERS? How
about checking a kernel's NMBCLUSTERS setting? I didn't see anything
in the sysctl man page.
> >Active Internet connections
> >Proto Recv-Q Send-Q Local Address Foreign Address (state)
> >netstat: kvm_read: kvm_read: Bad address
>
> Rebuild netstat; the networking structurs in the kernel have changed.
Got it. Thanks.
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