Re: Network performance with small packets - continued

["Chigurupati, Chaks" <chaks@wichorus.com>]

Hi Tom,

My two cents. Please look for [Chaks]

><snip>
>Comparing the transmit path to the receive path, the guest disables
>notifications after the first kick and vhost re-enables notifications
>after
>completing processing of the tx ring.  Can a similar thing be done for
>the
>receive path?  Once vhost sends the first notification for a received
>packet
>it can disable notifications and let the guest re-enable notifications
>when it
>has finished processing the receive ring.  Also, can the virtio-net
>driver do
>some adaptive polling (or does napi take care of that for the guest)?
>
>[Chaks] A better method is to have the producer generate the kick
>notifications only when the queue/ring transitions from empty to
>non-empty state. The consumer is not burdened with the task of reenabling
>the notifications. This of course assumes that notifications will never
>get lost. If loss of notifications is a possibility, producer can keep
>generating the notifications till guest signals (via some atomically
>manipulated memory variable) that it started consuming. The next
>notification will go out when the ring/queue again transitions from empty
>to non-empty state.

Chaks


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