Re: [PATCH net-next 0/3] net: add new socket option SO_RESERVE_MEM

On Mon, Sep 27, 2021 at 5:50 PM Jakub Kicinski [off-list ref] wrote:

On Mon, 27 Sep 2021 11:25:20 -0700 Wei Wang wrote:

quoted

This patch series introduces a new socket option SO_RESERVE_MEM.
This socket option provides a mechanism for users to reserve a certain
amount of memory for the socket to use. When this option is set, kernel
charges the user specified amount of memory to memcg, as well as
sk_forward_alloc. This amount of memory is not reclaimable and is
available in sk_forward_alloc for this socket.
With this socket option set, the networking stack spends less cycles
doing forward alloc and reclaim, which should lead to better system
performance, with the cost of an amount of pre-allocated and
unreclaimable memory, even under memory pressure.

Does not apply cleanly - would you mind rebasing/resending?

Sure. Will do. Sorry about that.

Would you be able to share what order of magnitude improvements you see?

OK. Will share some results from a synthetic benchmark.

Thanks!