Re: [PATCH net-next 4/4] virtio-net: auto-tune mergeable rx buffer size for improved performance

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On Wed, 2013-11-13 at 10:47 +0200, Ronen Hod wrote:

> I looked at how ewma works, and although it is computationally efficient,
> and it does what it is supposed to do, initially (at the first samples) it is strongly
> biased towards the value that was added at the first ewma_add.
> I suggest that you print the values of ewma_add() and ewma_read(). If you are
> happy with the results, then ignore my comments. If you are not, then I can
> provide a version that does better for the first samples.
> Unfortunately, it will be slightly less efficient.

Value is clamped by (GOOD_PACKET_LEN, PAGE_SIZE - hdr_len)

So initial value is conservative and not really used.

Thanks


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