[OpenAFS] klog very slow in Fedora Core Linux (kernel-2.6.14-1.1656_FC4)

[Derek Atkins]

Um, it did make it to the list just fine the first time.  Perhaps you
have yourself set to "don't receive own posts"?

Anyways, are you sure that the contents of /usr/vice/etc/CellServDB
for the local cell are correct?  Also, can you reach each of the
IPs that you get from a DNS lookup for the servers listed?

If you're getting "timed out talking to..." messages that implies that
you have a connectivity issue and can't reach one of the servers.  Perhaps
they are multi-homed or behind a NAT and you can't reach one of them?
That would certainly cause a timeout.

I'm 99% sure this is a configuration issue and not a code issue.

-derek

Quoting Paul Johnson <pauljohn32@gmail.com>:

> Hello, openafs list:
>
> I sent this last night, but it did not appear yet, sorry if you get 
> two copies.
>
> Our Sysadmin built an openafs server with very much storage and he
> says Windows clients access it without delay.  On my Linux systems,
> however, I observe some very strange/sluggish behavior.  And I don't
> know if the problem is in the kernel, or my authentication setup, or
> in openafs-client.
>
> I installed openafs by taking your openafs-1.4.0-1 src.rpm file and
> rebuilding so it created the kernel module.  After making the
> configuration changes in /usr/vice/etc and starting the services, I
> *guess* I did everything necessary.  I made no other configuration
> changes.
>
> When I type
>
> $ klog pauljohn
>
> the system waits for between 40 and 50 seconds. THere are no errors,
> and eventually the klog is approved.  The connection is good and I can
> move files in and out of /afs/ku.edu, our cell.
>
> This reminded me of a problem related to firewalls that I have with
> email sometimes.  The email system tries a reverse lookup and if my
> firewall is not opened, then it waits a while, then goes ahead.  But I
> turned off my firewall entirely ("service iptables stop") and the klog
> was still really slow.
>
> How to debug?  Is there some program I could get to monitor what's
> going on while klog is working?
>
> I've searched openafs email archives and see some people mentioning
> stale connection information making klog run slow, but this happened
> on my first connect.
>
> Perhas this is related, but perhaps this is a completely separate
> problem.  Sometimes file access stops abruptly and then restarts a
> minute or so later, and the end of the dmesg output says:
>
> pols110 kernel: afs: Lost contact with volume location server:
>
> $ fs checkservers
> All servers are running.
>
> What do you think?  In the startup information, from var log messages,
> I do find this warning about the "system call table":
>
> ip_conntrack version 2.3 (4084 buckets, 32672 max) - 236 bytes per conntrack
> openafs: module license 'http://www.openafs.org/dl/license10.html'
> taints kernel.
> Warning: failed to find address of system call table
> System call hooks will not be installed; proceeding anyway
> Starting AFS cache scan...<6>tg3: eth0: Link is up at 10 Mbps, half duplex.
> tg3: eth0: Flow control is off for TX and off for RX.
> found 935 non-empty cache files (9%).
> parport: PnPBIOS parport detected.
> parport0: PC-style at 0x378 (0x778), irq 7 [PCSPP,TRISTATE]
>
> What do you think?
>
>
> --
> Paul E. Johnson
> Professor, Political Science
> 1541 Lilac Lane, Room 504
> University of Kansas
> _______________________________________________
> OpenAFS-info mailing list
> OpenAFS-info@openafs.org
> https://lists.openafs.org/mailman/listinfo/openafs-info
>



-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord@MIT.EDU                        PGP key available