Mark McLoughlin wrote: > On Thu, 2008-05-29 at 16:34 +1000, Rusty Russell wrote: >> On Tuesday 27 May 2008 21:06:26 Mark McLoughlin wrote: >>> On Mon, 2008-05-26 at 17:42 +1000, Rusty Russell wrote: >>>> If we fail to transmit a packet, we assume the queue is full and put >>>> the skb into last_xmit_skb. However, if more space frees up before we >>>> xmit it, we loop, and the result can be transmitting the same skb twice. >>>> >>>> Fix is simple: set skb to NULL if we've used it in some way, and check >>>> before sending. >> Great! It's a corner case, but it's no more complicated to do it your way. >> >> Minor mod, I find it clearer to have the vi->last_xmit_skb = NULL; under >> the branch: >> >> Subject: [PATCH] virtio_net: Delay dropping tx skbs >> Date: Tue, 27 May 2008 12:06:26 +0100 >> From: Mark McLoughlin <[EMAIL PROTECTED]> >> >> Currently we drop the skb in start_xmit() if we have a >> queued buffer and fail to transmit it. >> >> However, if we delay dropping it until we've stopped the >> queue and enabled the tx notification callback, then there >> is a chance space might become available for it. > > Hmm, we lost this one somewhere along the way ...
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