Discuss December 2008

discuss@lists.centos.org

247 participants
257 discussions

CentOS-4 Xen kernel with low RAM and Badness in local_bh_enable at kernel/softirq.c:141
by Kingsly John 02 Dec '08

02 Dec '08

I have small xen VM running centos4 which acts as a router/firewall, and has been working fine for over 1.5 years with 32MB of RAM and a kernel I either got from xensource.org or built myself from their sources. (centos 4 didn't have a xen kernel back then) I lost the kernel to a corrupted disk and decided to use the centos provided xen kernel. All these months 32MB + 64MB Swap was more than sufficient and I never had any problems.(3-digit uptimes) The CentOS Xen kernel is unusable at 32MB and invokes the OOM killer even though there is plenty of swap free (and about 5-10MB of RAM too). After the OOM killer has done it's job there's about 15MB of RAM free and swap is hardly used at all (1MB at most) I've increased RAM to 64MB and the OOM killer doesn't kick in.. but I am seeing plenty of such messages in the logs ... Dec 2 16:05:21 noc kernel: Badness in local_bh_enable at kernel/softirq.c:141 Dec 2 16:05:21 noc kernel: [<c0121178>] local_bh_enable+0x47/0x6f Dec 2 16:05:21 noc kernel: [<c02177d5>] skb_checksum+0x133/0x25e Dec 2 16:05:21 noc kernel: [<c0250f06>] udp_poll+0x66/0x113 Dec 2 16:05:21 noc kernel: [<c02135fd>] sock_poll+0x19/0x1d Dec 2 16:05:21 noc kernel: [<c016d1a6>] do_select+0x190/0x2c7 Dec 2 16:05:21 noc kernel: [<c016ceb5>] __pollwait+0x0/0x9b Dec 2 16:05:21 noc kernel: [<c0144ae4>] __kmalloc+0x56/0xd3 Dec 2 16:05:21 noc kernel: [<c016d5dc>] sys_select+0x2e7/0x45c Dec 2 16:05:21 noc kernel: [<c010740f>] syscall_call+0x7/0xb Any idea what's causing it / how to make it stop ? I'm running Centos 5 in Dom0 and CentOS 4 in the router domU and there's another couple of Centos 5 domU which is running error free. Kingsly -- --------------------------------------------------------------------------- Kingsly At Users Dot SourceForge Dot Net -- http://kingsly.org/ ---------------------------------------------------------------------------

1 0

Any idea when we will have updated kmod-drbd82 rpm for the latest kernel?
by mbneto 02 Dec '08

02 Dec '08

Hi, After searching the archive I found one post (last october) complaining about lack of kmod-drbd2 rpm for the lastest kernels. Almost two months have passed and no sign of the rpm I was wondering if the mantainer has some news about it. Thanks.

2 1

script to find last accessed time?
by Tom Brown 02 Dec '08

02 Dec '08

Can anyone help me with the syntax to find last accessed time on a bunch of dir's - something like show me the files that were last accessed 6 months or more ago? thanks

4 3

Educentos?
by Christopher Chan 02 Dec '08

02 Dec '08

Is there an Edubuntu equivalent for Centos?

3 5

USB or PCI dialup modem supported by Centos
by Ramon Nieto 02 Dec '08

02 Dec '08

Hello everybody, I've searched google for a while looking for a list of USB or PCI dialup modems supported by CentOS without success. Any information on this subject will be really appreciated. Thank you.

8 24

Two NFS issues
by Russell Miller 01 Dec '08

01 Dec '08

Hi, I was hoping someone would have an idea of what's going on here... We have two NFS issues. One of which is certainly centos based, one of which we're not sure of. First issue is: As of Centos 5, we can't make simultaneous access to a directory via NFS. To duplicate, I cd into a share in two windows, copy a 1G file in the first window, and just do an ls in the other. The ls will hang until the write is done. Turning off apic seems to help a little, but there's still a very significant hang. This problem is not apparent in centos 4.x, even when mounting to the same NFS server. The other problem is - we're seeing tremendous slowdowns when going through an Acopia NFS virtualization server. These slowdowns got much more severe when we moved to Centos 5.2. If we connect to the NFS appliance directly, these slowdowns don't exist. Has anyone seen problems like this? How did you solve them? Thanks. --Russell

3 12

Neighbour table overflow
by Thomas Dukes 01 Dec '08

01 Dec '08

Just started getting this. I tried the following by adding it to my etc/sysctl.conf: net.ipv4.neigh.default.gc_thresh1 = 4096 net.ipv4.neigh.default.gc_thresh2 = 8192 net.ipv4.neigh.default.gc_thresh3 = 8192 net.ipv4.neigh.default.base_reachable_time = 86400 net.ipv4.neigh.default.gc_stale_time = 86400 That pretty much locked things up. Then I tried another googled solution: echo 256 > /proc/sys/net/ipv4/neigh/default/gc_thresh1 echo 512 > /proc/sys/net/ipv4/neigh/default/gc_thresh2 echo 1024 > /proc/sys/net/ipv4/neigh/default/gc_thresh3 And adding it also to etc/sysctl.conf: net.ipv4.neigh.default.gc_thresh1 = 256 net.ipv4.neigh.default.gc_thresh2 = 512 net.ipv4.neigh.default.gc_thresh3 = 1024 Still not working. Any ideas? TIA

9 23

following Centos wiki headless install, but applying to FC10
by Robert Moskowitz 01 Dec '08

01 Dec '08

I have successfully built an install CD following the instructions at: http://wiki.centos.org/TipsAndTricks/VncHeadlessInstall Now I am trying to do the same with FC10 and I am failing in two ways. I have tried to find a similar howto for even FC9, but have not found the right google magic. The first problem should be small. When I set isolinux.cfg to start with: prompt 1 timeout 0 I still get prompted. There is quite a bit more to the beginning of the FC10's isolinux.cfg so that might account for it. But fortunately I do have a keyboard of sorts and a monitor of sorts so I can get to my menu select for remote vnc install. The install then proceeds and gets to setting up eth0, but fails. It seems like dhcp is not succeeding. If I boot from the standard FC10 CD, hdcp does work. Here is my append line: append initrd=initrd.img vnc vncconnect=10.8.6.15 headless ip=dhcp ksdevice=eth0 meth od=http://server.foo.com/fedora/10/os/i386 lang=en_US keymap=us All these commands are listed at: http://fedoraforum.org/forum/showthread.php?t=25826 Any pointers to where to get help on this?

2 2

[CentOS] Apache, SELinux, and document root on a different partition
by Kenneth Porter 01 Dec '08

01 Dec '08

I want to put the document root for an application on a separate paritition that has more space. When I try to configure this I can't access the files in the new location. I've got the SELinux attributes set on the directory and its files, so I'm thinking it's something about the parent path that SELinux doesn't like, but I don't know where that's handled. My partition is mounted to /mnt/bigdisk2, and I put the app in the wbb3tmp subdirectory there: [root@centos wbb3-tmp]# ls -Za drwxr-xr-x apache apache system_u:object_r:httpd_sys_content_t . drwxr-xr-x root root system_u:object_r:file_t .. -rw-r--r-- apache apache system_u:object_r:httpd_sys_content_t WCFSetup.tar.gz -rw-r--r-- apache apache system_u:object_r:httpd_sys_content_t index.html -rw-r--r-- apache apache system_u:object_r:httpd_sys_content_t install.php -rw-r--r-- apache apache system_u:object_r:httpd_sys_content_t test.php [root@centos wbb3-tmp]# pwd /mnt/bigdisk2/wbb3-tmp My Apache VirtualHost block contains this: Alias /wbb3-tmp /mnt/bigdisk2/wbb3-tmp <Directory "/mnt/bigdisk2/wbb3-tmp"> AllowOverride AuthConfig Options Limit Options +Indexes -ExecCGI +FollowSymLinks +MultiViews Order allow,deny Allow from all </Directory> This works if I disable SELinux.

3 6

chmod for directories only
by Robert Moskowitz 01 Dec '08

01 Dec '08

I want to change the permissions on directories, recursively to: drwxr-xr-x but keep the files within the directory tree as: -rw-r--r-- But I can't find an option for chmod to only affect directories. I suppose it won't hurt (in this case) to set the x for the files, but I want some consistancy.

4 4

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

Discuss December 2008