On Wed, 16 Mar 2011 00:40:28 +0200 Jonathan Morton <[email protected]> wrote:
> > On 16 Mar, 2011, at 12:36 am, Rick Jones wrote: > > > Back and forth synchronization between driver and device is > > doubleplusungood. Being able to remove a packet on the tx queue already > > made known to the NIC sounds like it could become a rathole. If you are > > lucky, you *might* have a "valid/invalid" bit in a packet descriptor > > that the driver could hope to set before the NIC had pulled-in a copy > > across the I/O bus. > > Since this would be on the order of a second after submission, this seems > unlikely then. > > The even better solution would be if the hardware timed-out an old packet by > itself after about 1 second. Does this happen already? If not, can it? > > - Jonathan The real problem was the IEEE 802 design that does retransmit at link level and therefore ends up being outside of control of software. _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
