similar to: centos 6 and super jumbo frames

On 11/09/2015 12:36 PM, Gordon Messmer wrote: > On 11/09/2015 08:34 AM, Steve Clark wrote: >> Has anyone using CentOS 6 been able to successfully set an mtu larger >> than 9710 >> on an interface. > Maximum frame size varies from implementation to implementation: > http://pages.uoregon.edu/joe/jumbo-clean-gear.html > > It's also worth noting that that due to

On 11/09/2015 08:34 AM, Steve Clark wrote: > > Has anyone using CentOS 6 been able to successfully set an mtu larger > than 9710 > on an interface. Maximum frame size varies from implementation to implementation: http://pages.uoregon.edu/joe/jumbo-clean-gear.html It's also worth noting that that due to offloading features in modern NICs, there's often very little benefit

After successfully getting higher MTU to work on my Realtek NICs, I started testing the impact of higher MTU on file transfers using NFS exported ramdisk to ramdisk. The results were unexpected. The higher the MTU on the sending NIC, the lower the file transfer speed. I tested by using time cp to copy a 1GB file (In case compression might affect the results, so I dd the test file from the CentOS

Hi List, I have been searching for the correct createrepo command to make a 6.4 respin. We have been doing this with previous versions using createrepo -u "media://$discinfo" -g ${DIR}/my_kickstart${VER}/comps.xml . Which had worked fine until now. Thanks, -- Stephen Clark *NetWolves* Director of Technology Phone: 813-579-3200 Fax: 813-882-0209 Email: steve.clark at netwolves.com

Hello, Anybody else run into problems with biosdevname .0.5..0-2 changing names from p2p1 to em1 when upgrading from biosdevname 0.4.1-3? Darn! I thought biosdevname was to keep the names the same!! -- Stephen Clark *NetWolves Managed Services, LLC.* Director of Technology Phone: 813-579-3200 Fax: 813-882-0209 Email: steve.clark at netwolves.com http://www.netwolves.com

We are utilizing the xen hypervisor on nexenta with ISCSI as our method of communication with the guests (currently ubuntu but could be moving to centos). Obviously jumbo packet support would be nice to have. The last time I see that on the xen roadmap http://wiki.xensource.com/xenwiki/XenRoadMap . Is there a canonical place that spells out if jumbo frames are now supported or still on the

Hi, I have a confusing problem. I have two centos 5,5 boxes. Both have sudo.i386 1.7.2p1-9.el5_5 installed I am using the same sudoers file, but the one on box A keeps trying to do DNS lookups while the one on box B does not. How do I disable this DNS lookup? Thanks for any info. -- Stephen Clark *NetWolves* Sr. Software Engineer III Phone:

Alan& Akemi, Would it be possible to get CONFIG_ARPD turned on in the centosplus 6.x kernel? It is required to use opennhrp. See the link below where is was decided to turn it on in Fedora. https://bugzilla.redhat.com/show_bug.cgi?id=502844 -- Stephen Clark *NetWolves* Director of Technology Phone: 813-579-3200 Fax: 813-882-0209 Email: steve.clark at netwolves.com

Hi, I am setting up crashkernel and was wondering where I get the kernel-debug rpm for centosplus kernels. Thanks, -- Stephen Clark *NetWolves Managed Services, LLC.* Director of Technology Phone: 813-579-3200 Fax: 813-882-0209 Email: steve.clark at netwolves.com http://www.netwolves.com

On the network theme again. The adapters on the management/storage network all default to an mtu of 1500. Are there plans to be able to indicate when a network supports jumbo frames? Cheers, Justin.

Hello, I have 2 network cards on my 2 of my computers that I am trying to transfer data on. The second network cards are specifically for transferring files between the two so I enabled jumble frames by setting the mtu to 9000. I seem to be able to connect between the two via ssh and other methods using this setting so I thought everything was working right until I tried rsync. I used the

Hi List, FYI. We have been using CentOS 6.4 and have 2 vpn/gre tunnels to separate cisco rtrs using ospf. with kernel 2.6.32-358.23.2 We have upgraded to 6.5 bit using kernel 2.6.32-431.5.1 and the exact same configuration scripts for our vpn/gre tunnels. What I see is the first gre tunnel works great and I get an ospf neighbor. The second tunnel comes up and I can ping across it and I see

Hi, Has anyone else had trouble trying to reach the epel repo. I can only get to it if I change the https to http in the epel.repo file. -- Stephen Clark *NetWolves Managed Services, LLC.* Director of Technology Phone: 813-579-3200 Fax: 813-882-0209 Email: steve.clark at netwolves.com http://www.netwolves.com

Hi, Does anyone know if there is an option for the ifcfg-br file that matches the brctl setageing parameter? I am using KVM and am running a DPI guest and need this parameter set to 0 to get mirrored span port data to cross the bridge to the guest vnet device. Thanks, -- Stephen Clark *NetWolves Managed Services, LLC.* Director of Technology Phone: 813-579-3200 Fax: 813-882-0209 Email:

Hello List, Does anyone know why this is not available in CentOS 6.6. I found it in a SL repo but not in CentOS. I found several CentOS Bugs one answered by JH http://bugs.centos.org/print_bug_page.php?bug_id=6822 saying it had been added to 6.5 2013-12-09 19:05 JohnnyHughes Resolution open => fixed But it is still not available. cat /etc/redhat-release CentOS release 6.6 (Final)

Hi, I have an XCP 0.5 box running a few DomUs some of the DomU''s data is stored at (clustered lvm volumes on) a Coraid etherdrive box which is connected via an Ethernet cable to a dedicated card of the XCP box, for which in the network config I'' ve specified: MTU=9344: xe network-param-list uuid=.... gives: MTU ( RW): 9344 on the DomUs if I leave the MTU at 1500 (default

The documentation says the bridge will work as far as all interfaces have the same MTU, but I also read on this and other mailing lists people having problems when using jumbo frames. What is the current status of jumbo frames support in the bridge? It could also be useful to have the same info on the wiki page. Thanks. -- Luca Lesinigo -------------- next part -------------- An HTML

Hi List, Strange problem. I am running off of CentOS x86_64 6.4 usb key that is sdb I have ssd disk that has a centos image on it. I have mounted the partitions /dev/sda3 as /mnt/sysimage and /dev/sda1 as /mnt/sysimage/boot I am trying to chroot to /mnt/sysimage dir but get the following error. [root at localhost root]# /usr/sbin/chroot /mnt/sysimage /bin/bash /usr/sbin/chroot: failed to run

When using OCFS2 in a Oracle RAC set, one would configure OCFS2 to use the private interconnect address ( in cluster.conf). Are there any known issues / reasons not to have the private interconnect set up for jumbo frames when using in conjunction with OCFS2 ? Thanks -- -------------- next part -------------- An HTML attachment was scrubbed... URL: