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

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Date:   Wed, 17 Mar 2021 17:38:44 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Alexander Lobakin <alobakin@...me>,
        Mel Gorman <mgorman@...hsingularity.net>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        Christoph Hellwig <hch@...radead.org>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Net <netdev@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Linux-NFS <linux-nfs@...r.kernel.org>, brouer@...hat.com
Subject: Re: [PATCH 0/7 v4] Introduce a bulk order-0 page allocator with two
 in-tree users

On Wed, 17 Mar 2021 16:31:07 +0000
Alexander Lobakin <alobakin@...me> wrote:

> From: Mel Gorman <mgorman@...hsingularity.net>
> Date: Fri, 12 Mar 2021 15:43:24 +0000
> 
> Hi there,
> 
> > 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?

> 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.
> 
> > 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