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Jason Haar
*nix forums beginner
Joined: 17 Mar 2005
Posts: 23
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 Posted: Tue Jun 20, 2006 8:23 am Post subject:
Re: tcpserver strangeness on 64bit Opteron
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Feizhou wrote:
| Quote: | -v -H -P -R -l
and everything worked fine - funny how it doesn't cause a problem on the
other machines . .
Maybe the other machines have different dns settings? Are they identical?
It's probably IPv6 madness. If you've left it enabled (ifconfig eth0 |
will show you), then modern Linux boxes are forced to do the "AAA" DNS
lookups first "just in case" they get some IPv6 responses. These add
immeasurably to DNS slowest (I especially get burnt being down here in
New Zealand - where latency rules supreme).
Disable IPv6 via "echo alias net-pf-10 off >> /etc/modprobe.conf",
reboot, and see if those hangs have reduced in duration. Of course,
you'd now have to turn DNS lookups back ON in tcpserver in order to see
if I'm correct ;-)
--
Cheers
Jason Haar
Information Security Manager, Trimble Navigation Ltd.
Phone: +64 3 9635 377 Fax: +64 3 9635 417
PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1 |
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Feizhou
*nix forums Guru Wannabe
Joined: 15 Mar 2005
Posts: 131
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| Posted: Mon Jun 19, 2006 2:03 pm Post subject:
Re: tcpserver strangeness on 64bit Opteron
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Philip Rhoades wrote:
| Quote: | Roman, Richard,
On Mon, 2006-06-19 at 12:42 +0400, Roman Levitskiy wrote:
I am using a fairly standard netqmail install on a variety of machines:
i386, vitual PPC on iSeries and AMD 64bit Opteron. The Opteron smtp is
behaving strangely - if I telnet to the server on port 25 and type
"HELO" it takes 1m45s to respond - this is slow enough for a Eudora send
but Outlook fails with a timeout!
Looks like DNS lookup timeout.
Correct your DNS settings or exclude DNS lookup in tcpserver as
described in it's documentation.
Yep, I changed tcpserver flags to:
-v -H -P -R -l
and everything worked fine - funny how it doesn't cause a problem on the
other machines . .
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Maybe the other machines have different dns settings? Are they identical?
Nothing to do with RHEL4. The vm patch will not cause an over one minute
wait that can be simply fixed by a parameter to tcpserver. |
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Philip Rhoades
*nix forums beginner
Joined: 07 Feb 2005
Posts: 9
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| Posted: Mon Jun 19, 2006 11:17 am Post subject:
Re: tcpserver strangeness on 64bit Opteron
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Roman, Richard,
On Mon, 2006-06-19 at 12:42 +0400, Roman Levitskiy wrote:
| Quote: | I am using a fairly standard netqmail install on a variety of machines:
i386, vitual PPC on iSeries and AMD 64bit Opteron. The Opteron smtp is
behaving strangely - if I telnet to the server on port 25 and type
"HELO" it takes 1m45s to respond - this is slow enough for a Eudora send
but Outlook fails with a timeout!
Looks like DNS lookup timeout.
Correct your DNS settings or exclude DNS lookup in tcpserver as
described in it's documentation.
|
Yep, I changed tcpserver flags to:
-v -H -P -R -l
and everything worked fine - funny how it doesn't cause a problem on the
other machines . .
FTR, it is RHEL4.
Many thanks,
Phil.
--
Philip Rhoades
Pricom Pty Limited (ACN 003 252 275 ABN 91 003 252 275)
GPO Box 3411
Sydney NSW 2001
Australia
Mobile: +61:0411-185-652
Fax: +61:2:8923-5363
E-mail: phil@chu.com.au |
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Richard Lyons
*nix forums Guru
Joined: 08 Mar 2005
Posts: 312
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| Posted: Mon Jun 19, 2006 9:15 am Post subject:
Re: tcpserver strangeness on 64bit Opteron
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On Mon, 19 Jun 2006, Philip Rhoades wrote:
| Quote: | I am using a fairly standard netqmail install on a variety of machines:
i386, vitual PPC on iSeries and AMD 64bit Opteron. The Opteron smtp is
behaving strangely - if I telnet to the server on port 25 and type
"HELO" it takes 1m45s to respond - this is slow enough for a Eudora send
but Outlook fails with a timeout!
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Using gcc-3.4.x on an x86_64 architecture is known to generate bad code
(http://marc.theaimsgroup.com/?l=qmail&m=111725518121864&w=2,
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21804). I don't know if this
is your problem as you haven't indicated your OS or build environment, but
it should be easy enough to test - extract ucspi-tcp-0.88.tar.gz, do
"echo gcc > conf-cc ; make tcpserver" and perform your tests with the new
tcpserver.
Rick. |
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Roman Levitskiy
*nix forums beginner
Joined: 08 Jul 2005
Posts: 32
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| Posted: Mon Jun 19, 2006 8:42 am Post subject:
Re: tcpserver strangeness on 64bit Opteron
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| Quote: | I am using a fairly standard netqmail install on a variety of machines:
i386, vitual PPC on iSeries and AMD 64bit Opteron. The Opteron smtp is
behaving strangely - if I telnet to the server on port 25 and type
"HELO" it takes 1m45s to respond - this is slow enough for a Eudora send
but Outlook fails with a timeout!
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Looks like DNS lookup timeout.
Correct your DNS settings or exclude DNS lookup in tcpserver as
described in it's documentation.
--
Best, Roman. |
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Philip Rhoades
*nix forums beginner
Joined: 07 Feb 2005
Posts: 9
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| Posted: Mon Jun 19, 2006 8:14 am Post subject:
tcpserver strangeness on 64bit Opteron
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People,
I am using a fairly standard netqmail install on a variety of machines:
i386, vitual PPC on iSeries and AMD 64bit Opteron. The Opteron smtp is
behaving strangely - if I telnet to the server on port 25 and type
"HELO" it takes 1m45s to respond - this is slow enough for a Eudora send
but Outlook fails with a timeout!
When there is finally a response I see:
220 vic.chu.com.au ESMTP
in the Windows telnet app and:
@40000000449655790b4162c4 tcpserver: ok 21872 \
vic.chu.com.au:192.168.1.100:25 :192.168.1.58::4431
in /var/log/qmail/smtpd/current on the server.
I am using:
ucspi-tcp-0.88.tar.gz
that has in it:
10190 2000-03-19 02:18:42 ucspi-tcp-0.88/tcpserver.c
Should I be setting some 64bit switches in the compile or something?
Thanks,
Phil.
--
Philip Rhoades
Pricom Pty Limited (ACN 003 252 275 ABN 91 003 252 275)
GPO Box 3411
Sydney NSW 2001
Australia
Mobile: +61:0411-185-652
Fax: +61:2:8923-5363
E-mail: phil@chu.com.au |
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