Re: [Xen-devel] [PATCH 1/3] Make credit2 the default scheduler

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 05/02/18 11:36, George Dunlap wrote:
> Credit2 was declared "supported" in 4.8, and as of 4.10 had two other
> critical features implemented (soft affinity / NUMA and caps).
>
> Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>

On what justification?

Switching the default involves demonstrating that the new default is
better than the old one, and simply "we've implemented more features"
isn't good enough IMO.

The last set of measurements I recall seeing said that credit1 and
credit2 were mostly kneck-and-kneck, but there was still a noticeable
difference in credit1's favour when it came to aggregate small-packet
TCP throughput, and no benchmark where credit2 was clearly a winner.

~Andrew

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