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Re: [Xen-devel] [PATCH net] xen-netback: Fix handling of skbs requiring too many slots



On 04/06/14 16:09, annie li wrote:

On 2014/6/3 16:30, Zoltan Kiss wrote:
A recent commit (a02eb4 "xen-netback: worse-case estimate in
xenvif_rx_action is
underestimating") capped the slot estimation to MAX_SKB_FRAGS, but
that triggers
the next BUG_ON a few lines down, as the packet consumes more slots than
estimated.
This patch introduces full_coalesce on the skb callback buffer, which
is used in
start_new_rx_buffer() to decide whether netback needs coalescing more
aggresively. By doing that, no packet should need more than
XEN_NETIF_MAX_TX_SIZE / PAGE_SIZE data slots,

(XEN_NETIF_MAX_TX_SIZE+1) / PAGE_SIZE here?

Do you think about the GSO slot? That's why I wrote "data slot", however that's probably not a clear terminology. I'll add then that excluding GSO slot, as it doesn't carry data directly, therefore it's irrelevant from this point of view.

Zoli

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