Hello,
is there anybody running the most recent kernels, to be able to check
their behaviour?
I made a test on 2.6.9, compiling Coda module 6.2 for Red Hat Enterprise
Linux 4 (their custom kernel lacks the module) and running a Coda client
(6.0.11).
Unfortunately, the result is the same as last time I used 2.6.8 this summer,
shell pipelines lead to failures at running some parts of the pipe.
It looks like concurrent lookups on a user space ("slow") filesystem are prone
to race conditions in 2.6. I have reasons to believe Jan's analysis which says
that it is the kernel's, not Coda's fault.
-------------------------------------------------------------
~$ uname -a
Linux xxx.yyy.chalmers.se 2.6.9-11.EL #1 Fri May 20 18:17:57 EDT 2005 i686
unknown unknown GNU/Linux
~$ cp /bin/cat /coda/testserver.coda.cs.cmu.edu/playground/c
~$ export PATH=${PATH}:/coda/testserver.coda.cs.cmu.edu/playground
~$ type c
c is /coda/testserver.coda.cs.cmu.edu/playground/c
~$ echo abc | c | c | c | c | wc
1 1 4
~$ echo abc | c | c | c | c | c | wc
0 0 0 <<----
~$ echo abc | c | c | c | c | c | c | wc
1 1 4
~$ echo abc | c | c | c | c | c | c | c | wc
1 1 4
~$ echo abc | c | c | c | c | c | c | c | c | wc
1 1 4
~$ echo abc | c | c | c | c | c | c | c | c | c | wc
1 1 4
~$ echo abc | c | c | c | c | c | c | c | c | c | c | wc
1 1 4
~$ echo abc | c | c | c | c | c | c | c | c | c | c | c | wc
0 0 0 <<----
~$ echo abc | c | c | c | c | c | c | c | c | c | c | c | c | wc
0 0 0 <<----
~$ echo abc | c | c | c | c | c | c | c | c | c | c | c | c | wc
0 0 0 <<----
~$ echo abc | c | c | c | c | c | c | c | c | c | c | c | c | wc
0 0 0 <<----
~$ echo abc | c | c | c | c | c | c | c | c | c | c | c | c | wc
0 0 0 <<----
~$ echo abc | c | c | c | c | c | c | c | c | c | c | c | c | wc
1 1 4
~$ echo abc | c | c | c | c | c | c | c | c | c | c | c | c | wc
0 0 0 <<----
~$
-------------------------------------------------------------
To give an idea about the machine where I tested:
-------------------------------------------------------------
~$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 2
model name : Intel(R) Pentium(R) 4 CPU 1.80GHz
stepping : 4
cpu MHz : 1816.972
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
bogomips : 3579.90
-------------------------------------------------------------
Anybody who can check/confirm on the latest kernels?
(be careful if running things from playground! you can be easily troyaned,
better use some private area on Coda)
Regards,
--
Ivan
