Mailinglist Archive: opensuse-bugs (4067 mails)

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[Bug 712958] Kernel Problems Under Multi-User Loads

https://bugzilla.novell.com/show_bug.cgi?id=712958

https://bugzilla.novell.com/show_bug.cgi?id=712958#c4


Michal Hocko <mhocko@xxxxxxxxxx> changed:

What |Removed |Added
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CC| |mhocko@xxxxxxxxxx

--- Comment #4 from Michal Hocko <mhocko@xxxxxxxxxx> 2011-08-22 16:23:56 CEST
---
(In reply to comment #0)
[...]
The first visible sign of problem is the network. Here is the network stats
on
an OpenSuse 11.3 server which is being hammered with networking and working
well. Note the low RX packets.

eth0 Link encap:Ethernet HWaddr F4:CE:46:C0:EA:A8
inet addr:128.222.233.237 Bcast:128.222.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1970250698 errors:0 dropped:175 overruns:0 frame:0

On this OpenSuse 11.4 server (which is used to deploy GNOME to thin clients),
here is the same information:

eth0 Link encap:Ethernet HWaddr 00:1C:C4:93:DF:72
inet addr:128.222.99.243 Bcast:128.222.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:67783895 errors:0 dropped:175438 overruns:0 frame:0

You seem to have _much_ bigger packet drop with 11.4 wrt 11.3. Is any of your
infrastructure relying on the network (ldap...)


The other very visible issue is disk performance. I've noticed:
- If you type in 'vi /etc/hosts' it sits for 3-4 seconds with a blinking
cursor
before the file appears. I tried it from the console and it's doing the same
thing.

Have you tried to strace/ltrace this command with timing information? (strace
-tt -o strace.log vi /etc/hosts)

- If you change a password for a user, it sits for 3-4 seconds before the
prompt comes back.

This would point to ldap.

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