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xen-devel
[Xen-devel] Re: [7/11] [NET] back: Added tx queue
On Thu, Jul 27, 2006 at 02:15:29PM +0100, Keir Fraser wrote:
>
> What's the default queue size? It shouldn't be too large if each packet
> can be 64kB!
The default is 1000. If 64MB is too much for each domain, then how about
100?
> Also, what does NETIF_F_LLTX have to do with whether we have a queue or
> not -- couldn't we set that all the time? And you set queue length to 1
Sorry, should've add a comment about that. NETIF_F_LLTX is just an unused
bit from the features set to indicate the fact that queueing is supported.
I suppose I could add a new flag too.
> in the other case -- what's wrong with zero? Seems a saner value when
> there is no queue: or do we need to commit to having *some* queue at
> register_netdevice() time, and there's no way to go back from that by
> the time we find out if netfront supports rx refill notifications (so
> at that point we cannot change queue len to zero)?
Exactly. Once we've committed to having a queue, setting the queue
length to zero will cause all packets to be dropped. I even added
a comment about that :)
Cheers,
--
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
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