Description of problem:
When I run multiple netperf clients on host, they connect with the
netperf-server in guest.
clients fail to execute cmds and output "interrupted system call"

Version-Release number of selected component (if applicable):
kvm-83-236.el5
2.6.18-266.el5

How reproducible:
always

Steps to Reproduce:
1. boot up a guest with rtl8139
2. setup and launch netperf server in guest
guest)# ./netserver
3. setup and launch multiple netperf client in host.
host)# while true;do ./netperf -t TCP_STREAM -H $guest_ip ;echo Tcp:$?;done &
host)# while true;do ./netperf -t UDP_STREAM -H $guest_ip;echo Udp:$?;done &
host)# while true;do ./netperf -H $guest_ip -- -m 200; echo $? Other:$?;done &
  
Actual results:
netperf clients outputted:
interrupted system call 
netperf remote error 4


Expected results:
netperf commands completed. 

Additional info: