RE: RE: Squid is OK, but which UNIX for high loads?

From: Rania Fakhoury <>
Date: Fri, 23 May 1997 15:30:04 +0300

Hi all,
I HIGHLY appreciate all the responses I got from you guys.
Let me mention a couple of issues regarding this problem
1) The problem is not swapping. I'm continously checking hard disk activity, and it's normal (disk light is almost off 60% of the time, and memory is plentiful)
2) I had Linux 2.0.30 compiled with SYN-COOKIES and SYN_RESET options enabled. These are supposed to protect my Linux from SYN attacks. However, when I disabled them and recompiled the kernel, I got almost 60% increase in performance during peak times!!
3) Even though I have an old NE2000 compatible card, I don't beleive it's the problem. This is the way I check Squid:
 * I telnet to port 8082 (cache port), wait for the "Escape character is '^]'." messae
 * I issue a "GET" command (simply "GET"), and wait for the HTML error to appear

TTP/1.0 400 Cache Detected Error
Content-type: text/html

<H2>Invalid HTTP Request</H2>


Generated by squid/
This error message appears instantly when the load is rather low. Problem begins at peak hours (load ~ 70,000 hits/hour). During these times, the "Escape character is '^]'." shows rather quickly (Squid rarely hangs at this stage). However, when I issue the "GET" command, I sometimes wait 6-7 seconds for the error message to come up! and THIS IS THE PROBLEM!
I said the net card was not problem, because I also telnetted to (the loopback address) and got the same delay.

Again, any would be appreciated.

PS: I have nothing against FreeBSD. I just don't have much experience with. My field is Solaris and Linux

Received on Fri May 23 1997 - 05:32:18 MDT

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