Re: [Xen-devel] [PATCH net V2] xen-netback: use jiffies_64 value to calculate credit timeout

[David Vrabel <dvrabel@xxxxxxxxxx>]

On 28/10/2013 11:35, Wei Liu wrote:
> time_after_eq() only works if the delta is < MAX_ULONG/2.
> 
> For a 32bit Dom0, if netfront sends packets at a very low rate, the time
> between subsequent calls to tx_credit_exceeded() may exceed MAX_ULONG/2
> and the test for timer_after_eq() will be incorrect. Credit will not be
> replenished and the guest may become unable to send packets (e.g., if
> prior to the long gap, all credit was exhausted).
> 
> Use jiffies_64 variant to mitigate this problem for 32bit Dom0.

Reviewed-by: David Vrabel <david.vrabel@xxxxxxxxxx>

David

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel