Re: [PATCH 0/7 v4] Introduce a bulk order-0 page allocator with two in-tree users

From: Jesper Dangaard Brouer <redacted>
Date: Wed, 17 Mar 2021 17:38:44 +0100

On Wed, 17 Mar 2021 16:31:07 +0000
Alexander Lobakin [off-list ref] wrote:

quoted

From: Mel Gorman <redacted>
Date: Fri, 12 Mar 2021 15:43:24 +0000

Hi there,

quoted

This series is based on top of Matthew Wilcox's series "Rationalise
__alloc_pages wrapper" and does not apply to 5.12-rc2. If you want to
test and are not using Andrew's tree as a baseline, I suggest using the
following git tree

git://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git mm-bulk-rebase-v4r2

I gave this series a go on my setup, it showed a bump of 10 Mbps on
UDP forwarding, but dropped TCP forwarding by almost 50 Mbps.

(4 core 1.2GHz MIPS32 R2, page size of 16 Kb, Page Pool order-0
allocations with MTU of 1508 bytes, linear frames via build_skb(),
GRO + TSO/USO)

What NIC driver is this?

Ah, forgot to mention. It's a WIP driver, not yet mainlined.
The NIC itself is basically on-SoC 1G chip.

quoted

I didn't have time to drill into the code, so for now can't provide
any additional details. You can request anything you need though and
I'll try to find a window to collect it.

quoted

Note to Chuck and Jesper -- as this is a cross-subsystem series, you may
want to send the sunrpc and page_pool pre-requisites (patches 4 and 6)
directly to the subsystem maintainers. While sunrpc is low-risk, I'm
vaguely aware that there are other prototype series on netdev that affect
page_pool. The conflict should be obvious in linux-next.

--
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer

Al