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Re: TCP performance regression in mac80211 triggered by the fq code

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Dave Taht <dave.taht@xxxxxxxxx> writes:

>> As for why this would happen... There could be a bug in the dequeue code
>> somewhere, but since you get better performance from sticking everything
>> into one queue, my best guess would be that the client is choking on the
>> interleaved packets? I.e. expending more CPU when it can't stick
>> subsequent packets into the same TCP flow?
>
> I share this concern.
>
> The quantum is? I am not opposed to a larger quantum (2 full size
> packets = 3028 in this case?).

The quantum is hard-coded to 300 bytes in the current implementation
(see net/fq_impl.h).

-Toke
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