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Re: [Xen-users] udp packet loss

To: jonr@xxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx

From: Hongbo Zhu <hongbo_zhu@xxxxxxxxx>

Date: Fri, 24 Oct 2008 17:41:07 -0700 (PDT)

Cc:

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List-id: Xen user discussion <xen-users.lists.xensource.com>

dmesg on both domU and dom0 showed nothing related to packet dropping. If I do "ifconfig peth0" on dom0, I can see the number of dropped packets keep increasing.

From: "jonr@xxxxxxxxxx" <jonr@xxxxxxxxxx>
To: xen-users@xxxxxxxxxxxxxxxxxxx
Sent: Friday, October 24, 2008 5:34:19 PM
Subject: Re: [Xen-users] udp packet loss

Quoting Hongbo Zhu <hongbo_zhu@xxxxxxxxx>:

> I was sending 5000 syslog messages per second to a virtual machine
> running on a CentOS 5.2 host, I have a program running on the
> virtual machine that receives and processes the syslog messages.
> What I observed is that there is about 30% packets dropped by the
> dom0 peth0 interface. During the test period, the CPU usage on the
> virtual machine is about 30-40%. I already did : echo 256 >
> /sys/class/net/eth0/rxbuf_min on the domU.
>
> Does anyone know how this happen?
>
> Thanks,
>
> Hongbo

In 'dmesg' are you seeing connection tracking full dropping packets or
something similar?

Jon

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