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

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Message-ID: <20210317165220.808975-1-alobakin@pm.me>
Date:   Wed, 17 Mar 2021 16:52:32 +0000
From:   Alexander Lobakin <alobakin@...me>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Alexander Lobakin <alobakin@...me>,
        Mel Gorman <mgorman@...hsingularity.net>,
        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>
Subject: Re: [PATCH 0/7 v4] Introduce a bulk order-0 page allocator with two in-tree users

From: Jesper Dangaard Brouer <brouer@...hat.com>
Date: Wed, 17 Mar 2021 17:38:44 +0100

> 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?

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

> > 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

Al