Re: lmbench on linux-2.4.0-test[4-11]

Re: lmbench on linux-2.4.0-test[4-11]

[David S. Miller]

   Date:   Tue, 28 Nov 2000 11:08:17 +0100
   From: Lorenzo Allegrucci <lenstra@tiscalinet.it>

   Does anyone confirm this problem?

Increase the space between the two numbers configured in
/proc/sys/net/ipv4/ip_local_port_range, try a configuration
such as:

echo "32768 61000" >/proc/sys/net/ipv4/ip_local_port_range

I bet the problem goes away then.

Later,
David S. Miller
davem@redhat.com
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lmbench on linux-2.4.0-test[4-11]

[Lorenzo Allegrucci]

About 2 times on 3 lmbench-2alpha12 stops at "Local networking".
Below is a 'ps l':

  F   UID   PID  PPID PRI  NI   VSZ  RSS WCHAN  STAT TTY        TIME COMMAND
100     0   207     1   9   0  1980 1204 wait4  S    tty1       0:00 -bash
100     0   208     1  14   0  1968 1188 wait4  S    tty2       0:00 -bash
000     0   209     1   9   0  1004  456 read_c S    tty3       0:00
/sbin/getty 38400 tty3
000     0   210     1   9   0  1004  456 read_c S    tty4       0:00
/sbin/getty 38400 tty4
000     0   211     1   9   0  1004  456 read_c S    tty5       0:00
/sbin/getty 38400 tty5
000     0   212     1   9   0  1004  456 read_c S    tty6       0:00
/sbin/getty 38400 tty6
000     0  4096   207   9   0  1168  588 wait4  S    tty1       0:00 make
results
000     0  4255  4096   9   0  1748  852 wait4  S    tty1       0:00
/bin/sh ../scripts/results
000     0  4289  4255   9   0  1768  872 wait4  S    tty1       0:00
/bin/sh ../../scripts/lmbench CONFIG.lenstra
040     0  4740     1  10   0  1000  292 tcp_da S    tty1       0:00
lat_connect -s
040     0  4742     1   9   0  1068  380 wait_f S    tty1       0:00 bw_tcp -s
000     0  4753  4289  10   0  1036  480 inet_w S    tty1       0:00
lat_connect localhost
100     0  4761   208  17   0  2872 1256 -      R    tty2       0:00 ps l

lat_connect and bw_tcp are not running.
It looks like a deadlock between connect() and accept().

2.4.0-test[1-2] are not affected, don't know test3.
Athlon UP machine. All kernels compiled with the same
configuration and compiler, gcc 2.95.2

Does anyone confirm this problem?

--
Lorenzo
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Re: lmbench on linux-2.4.0-test[4-11]

[David S. Miller]

   Date:   Tue, 28 Nov 2000 18:23:52 +0100
   From: Lorenzo Allegrucci <lenstra@tiscalinet.it>

   BTW, all local services (smtp, telnet etc) work well.  Any ideas?

No ideas, and since the indicated programs from lmbench work
perfectly fine here on my machines, you're going to have to do some
detective work so we can figure out whats wrong.

You need to do some strace'ing of the affected programs and try
to figure out exactly how they get stuck and for what reason.

Later,
David S. Miller
davem@redhat.com
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Re: lmbench on linux-2.4.0-test[4-11]

[Lorenzo Allegrucci]

At 01.57 28/11/00 -0800, you wrote:
>   Date:   Tue, 28 Nov 2000 11:08:17 +0100
>   From: Lorenzo Allegrucci <lenstra@tiscalinet.it>
>
>   Does anyone confirm this problem?
>
>Increase the space between the two numbers configured in
>/proc/sys/net/ipv4/ip_local_port_range, try a configuration
>such as:
>
>echo "32768 61000" >/proc/sys/net/ipv4/ip_local_port_range
>
>I bet the problem goes away then.

ip_local_port_range already comes with such configuration.
Anyhow, now even test1 shows the problem :-(
I can run lmbench on 2.2.x kernels only.
BTW, all local services (smtp, telnet etc) work well.
Any ideas?

--
Lorenzo
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