Bug 29306

Summary:	Network or kernel related performance problem.
Product:	Base System	Reporter:	Dirk Zoller <duz>
Component:	kern	Assignee:	freebsd-bugs (Nobody) <bugs>
Status:	Closed FIXED
Severity:	Affects Only Me
Priority:	Normal
Version:	4.3-RELEASE
Hardware:	Any
OS:	Any

Description Dirk Zoller 2001-07-29 23:20:01 UTC

We're building a big client-server system. We have a test program for
our fundamental message passing library. The test program can act as
server or client. To run a little torture test on a system we start
a number of clients simultaneously. The clients send a lot of random
sized messages and the server echoes these.

When I run 10 clients on FreeBSD the whole system becomes very
sluggish while `top' reports the system was mostly idle. The torture
test takes extremely long and even when it's finished, the system
needs a while to recover from the trauma and return to normal
performance.

With Linux/NetBSD/WindowsNT I can run the same torture test with
50 clients with no problems. These systems stay responsive while
top reports they are busy. The whole torture test finishes in the
expected time.

I'd say, FreeBSD has a significant kernel problem here.

Fix: 

Sorry, I'm not a kernel hacker.
How-To-Repeat: Please contact me for the test program that I will provide happily.
Run my test program on a freshly installed vanilla 4.3 FreeBSD system
using the precompiled GENERIC kernel.

Comment 1 Peter Pentchev 2001-07-30 10:19:50 UTC

On Sun, Jul 29, 2001 at 03:18:18PM -0700, Dirk Zoller wrote:
> 
> >Number:         29306
> >Category:       kern
> >Synopsis:       Network or kernel related performance problem.
> >Originator:     Dirk Zoller
> >Release:        4.3-RELEASE
> >Organization:
> Sol-3 GmbH&Co KG
> >Environment:
> FreeBSD europa.sol-3.de 4.3-RELEASE FreeBSD 4.3-RELEASE #0: Sat Apr 21 10:54:49 GMT 2001     jkh@narf.osd.bsdi.com:/usr/src/sys/compile/GENERIC  i386
> >How-To-Repeat:
> Please contact me for the test program that I will provide happily.
> Run my test program on a freshly installed vanilla 4.3 FreeBSD system
> using the precompiled GENERIC kernel.

Could you provide said test program, either as a follow-up to this PR
(send a message to freebsd-gnats-submit@FreeBSD.org, keeping this
subject line), or at a website, giving the URL as a follow-up to the PR?

G'luck,
Peter

-- 
I am jealous of the first word in this sentence.

Comment 2 ashp freebsd_committer

2002-01-18 02:52:53 UTC

State Changed
From-To: open->closed

While this sounds like an interesting PR, there's been no activity 
for over half a year.  If this is still an issue, please open a new 
PR and attach the testing program so that we can fix the problem.