Re: are dropped packets a sign of network problem?

["Gabriel M. Schuyler" <gabriel@xxxxxxxxxxxxxxxxxxxx>]

We've had some network problems that were resolved by disabling tcp checksum offloading on all the domUs.  Our symptom was we couldn't ssh (or do much else) between two domUs on the same physical host.

So on each domU we run:

  sudo /sbin/ethtool -K eth0 tx off

Hope this helps!

Gabe

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Gabriel M. Schuyler, sysop

Intercasting Corporation

On Oct 10, 2007, at 12:11 AM, progressdll wrote:

in a xen environment , i see a lot op dropped packets via netstat -i

Is this a sign of network problems, or is it normal to see this kind of

numbers? i'm not sure how to interprete the data. is this normal, bad,

critical. What are your stats on this?

I guess i have a xen issue of some sort, but not sure what yet

# netstat -i

Kernel Interface table

Iface       MTU Met    RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP

TX-OVR Flg

eth0       1500   0 53999491      0      0      0  6234874      0      0     

0 BMRU

lo        16436   0  9247734      0      0      0  9247734      0      0     

0 LRU

peth0      1500   0 135679270      0      0      0 95455766      0      0     

0 BORU

tap0       1500   0  5411876      0      0      0 35071803      0      0     

0 BMRU

vif-vmdeb  1500   0        0      0      0      0       35      0 333350     

0 BORU

vif0.0     1500   0  6234874      0      0      0 53999492      0      0     

0 BORU

vif6.0     1500   0 55813641      0      0      0 98482968      0 482338     

0 BORU

vif6.1     1500   0        0      0      0      0       39      0 46875771     

0 BORU

vif68.0    1500   0        0      0      0      0        0      0      0     

0 BOU

vif69.0    1500   0  9349348      0      0      0 30571290      0   3282     

0 BORU

vif69.1    1500   0        0      0      0      0       44      0 18947590     

0 BORU

vif70.0    1500   0   129605      0      0      0   460256      0    702     

0 BORU

vif70.1    1500   0        0      0      0      0       35      0 333350     

0 BORU

xenbr0     1500   0 46298695      0      0      0        0      0      0     

0 BORU

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View this message in context: http://www.nabble.com/are-dropped-packets-a-sign-of-network-problem--tf4598987.html#a13130626

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