intermittent ip_vs_send_async error

[jamona perez]

I am using lvs for more than a year now, basically using an ultramonkey 
installation with 2 directors and 7 realservers (DR), and I got almost every 
day several messages
ip_vs_send_async error
my ha.cf uses the line
LVSSyncDaemonSwap::master
so i assume that the sync is done over eth0.
Is there any reason for that message to appear ?
It seems that it happens more frequently on busy times, so i'll supect 
network congestion, but the thing is : all hardware is bi-Xeon 1U servers 
and all network is GigaE while total bw used is less than 50 Mb/s ; packet 
rate is also not that high (top is at 12 Kpps, the overall packet rate of 
the switch is up to 30 Kpps, theoretically supporting up to 35 Mpps)
I'm not that much worried, because everything works fine anyway, but still 
it is strange...
If anyone could help, it would be appreciated

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