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[Qemu-discuss] Packet loss, high latency with NE2000

From: Robert Schilling
Subject: [Qemu-discuss] Packet loss, high latency with NE2000
Date: Sat, 12 Jan 2013 13:20:06 +0100

I have a NE2000 ethernet card connect via PCI and IRQ11. I wrote a device 
driver for NE2000 for my OS. I'm using qemu 1.2 with the bridge helper to 
bridge with my host linux.

I call qemu the following way:
sudo qemu-system-i386 -m 8M -cpu qemu32 -hda SWEB-flat.vmdk -debugcon 
/dev/stdout -netdev bridge,id=hn0 -device ne2k_pci,netdev=hn0,id=nic1

What I experience now, is that there is a lack between the packet sending from 
the host system and the reception in qemu. I'm using the ping command. This 
does an ARP-Request but the ARP request is received shifted. The same applies 
for the ICMP packets coming from the ping command. I get a latency of 4 to 10 

The ping command also tells me that there is a packet loss!!

My IP-stack doesn't seem the problem, since I don't see the other missed 
packets in log. There is an output at start and end of my IRQ handler.

Does anybody know how to dig in further? Or where a problem may be?

Thanks Robert

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