Rafał Radecki
2013-Jul-18 08:48 UTC
[CentOS-virt] KVM, virtualized interface, dropped packets.
Hi All.
I have currently a small problem to solve. I have a kvm virtual machine
which in output of
ifconfig eth0 | egrep 'RX packets|TX packets'
RX packets:792681304 errors:0 dropped:560728 overruns:0 frame:0
TX packets:716661674 errors:0 dropped:0 overruns:0 carrier:0
show dropped packets. I think that rx buffer is to small (no strange
messagess in dmesg) and would like to make it larger. But when I try a
solution from
http://www.scottalanmiller.com/linux/2011/06/20/working-with-nic-ring-buffers/
I get:
ethtool -g eth0
Ring parameters for eth0:
Cannot get device ring settings: Operation not supported
So what is the proper way to make rx buffers larger in this situation?
Best regards,
Rafal Radecki.
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<div>This massage can <span style="border-collapse:separate;color:#000000;font-family:Arial;font-style:normal;font-variant:normal;font-weight:normal;line-height:normal;text-align:auto;text-transform:none;font-size:medium;"><span style="font-family:Tahoma,Verdana,"Lucida Sans Unicode",sans-serif;font-size:13px;">appear if you try to apply command to bridge for example. maybe you should apply comman on one of real iface or </span></span><code>sysctl </code></div><div>http://www.cyberciti.biz/faq/linux-tcp-tuning/</div><div> </div><div>18.07.2013, 12:49, "Rafał Radecki" <radecki.rafal@gmail.com>:</div><blockquote type="cite"><div dir="ltr">Hi All.<div> </div><div>I have currently a small problem to solve. I have a kvm virtual machine which in output of</div><div><div>ifconfig eth0 | egrep 'RX packets|TX packets'</div><div> RX packets:<span>792681304</span> errors:0 dropped:560728 overruns:0 frame:0</div><div> TX packets:<span>716661674</span> errors:0 dropped:0 overruns:0 carrier:0</div></div><div>show dropped packets. I think that rx buffer is to small (no strange messagess in dmesg) and would like to make it larger. But when I try a solution from </div><div><a href="http://www.scottalanmiller.com/linux/2011/06/20/working-with-nic-ring-buffers/">http://www.scottalanmiller.com/linux/2011/06/20/working-with-nic-ring-buffers/</a><br /><div>I get:</div><div>ethtool -g eth0 </div><div>Ring parameters for eth0:</div><div>Cannot get device ring settings: Operation not supported</div></div><div> </div><div>So what is the proper way to make rx buffers larger in this situation?</div><div> </div><div>Best regards,</div><div>Rafal Radecki.</div></div>,<p>_______________________________________________<br />CentOS-virt mailing list<br /><a href="mailto:CentOS-virt@centos.org">CentOS-virt@centos.org</a><br /><a href="http://lists.centos.org/mailman/listinfo/centos-virt">http://lists.centos.org/mailman/listinfo/centos-virt</a></p></blockquote><div> </div><div> </div><div>-- <br />Трудно жить ничего не делая, но мы привыкли бороться с трудностями.</div>