Consuming request body allocates a lot

[rynowak]

Introduced by this change: fb01ea3

Allocations for 3000 requests to a simple API site:

This is 80kb per request. The Stream needs to override CopyToAsync

[rynowak]

/cc @halter73

[Tratcher]

CopyToAsync isn't virtual. Really you want a Drain method that re-uses the buffer per connection.

[rynowak]

https://msdn.microsoft.com/en-us/library/hh158751(v=vs.110).aspx

The longest overload is

[benaadams]

Should be 81Kb? Just read to null buffer rather than Copy? (Read+Write)

#300

[rynowak]

Oh my! you're right, numbers are hard. That is 80kb per request.

I was wondering why my buffer pooling prototype improved allocations by -240mb 😆

[benaadams]

Should also be resolved 👍