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Re: [Qemu-devel] [PATCH] net: add raw backend - some performance measur
From: |
Or Gerlitz |
Subject: |
Re: [Qemu-devel] [PATCH] net: add raw backend - some performance measurements |
Date: |
Tue, 21 Jul 2009 16:41:38 +0300 |
User-agent: |
Thunderbird 2.0.0.19 (X11/20081209) |
Herbert Xu wrote:
> On Tue, Jul 21, 2009 at 03:01:42PM +0300, Michael S. Tsirkin wrote:
>> the thing to check then would be that some kind of misconfiguration
>> does not cause the bridge to flood your packets to multiple interfaces.
> Right, we should make sure that the interfaces are not in promiscous mode
Michael, Herbert,
First, I don't see how flooding can happen in my setup, I have only two
interfaces on
the bridge (see below), a tap and a NIC (vlan) and the bridge will never
attempt to forward
a packet through the port it was received. Second, the bridge always set all
interfaces
attached to it to be in promiscous mode, see the call to dev_set_promiscuity()
from br_add_if()
but this doesn't mean it applied flooding, it does mac learning...
Or.
# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.0030485f9977 no eth1.4009
tap0
The VM mac is de:ab:be:01:01:09 and the remote node mac is 00:30:48:65:a6:2b,
you
can see that these two macs were learned by the bridge and hence no flooding is
expected.
# brctl showmacs br0
port no mac addr is local? ageing timer
1 00:30:48:5f:99:77 yes 0.00
1 00:30:48:65:a6:2b no 12.50
2 06:f5:76:64:a0:d4 yes 0.00
2 de:ab:be:01:01:09 no 0.00
- Re: [Qemu-devel] [PATCH] net: add raw backend - some performance measurements, (continued)
- Re: [Qemu-devel] [PATCH] net: add raw backend - some performance measurements, Or Gerlitz, 2009/07/21
- Re: [Qemu-devel] [PATCH] net: add raw backend - some performance measurements, Herbert Xu, 2009/07/21
- Re: [Qemu-devel] [PATCH] net: add raw backend - some performance measurements, Or Gerlitz, 2009/07/21
- Re: [Qemu-devel] [PATCH] net: add raw backend - some performance measurements, Michael S. Tsirkin, 2009/07/21
- Re: [Qemu-devel] [PATCH] net: add raw backend - some performance measurements, Or Gerlitz, 2009/07/21
- Re: [Qemu-devel] [PATCH] net: add raw backend - some performance measurements, Michael S. Tsirkin, 2009/07/21
- Re: [Qemu-devel] [PATCH] net: add raw backend - some performance measurements, Herbert Xu, 2009/07/21
- Re: [Qemu-devel] [PATCH] net: add raw backend - some performance measurements,
Or Gerlitz <=
Message not available
Re: [Qemu-devel] [PATCH] net: add raw backend, Michael S. Tsirkin, 2009/07/02