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From:   Jones Syue <jonessyue@qnap.com>
Date:   Mon, 27 Apr 2020 10:49:37 +0800
Message-ID: <CAEUGjKh--8qs_pn1OjuQk3DmtVuqLo9m5ecL-Lwb08Hk2oZTUg@mail.gmail.com>
Subject: Re: [PATCH] cifs: improve read performance for page size 64KB &
 cache=strict & vers=2.1+
To:     linux-cifs <linux-cifs@vger.kernel.org>
Cc:     Pavel Shilovsky <piastryyy@gmail.com>,
        Steve French <smfrench@gmail.com>,
        Samba Technical <samba-technical@lists.samba.org>,
        Kernel Mailing List <linux-kernel@vger.kernel.org>
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> > And if anyone figures out how to configure an x86_64 Linux to use
> > PAGE_SIZE of 64K or larger let me know...
> I am using physical platform with arm cpu and aarch64 toolchain,
> perhaps try qemu-system-aarch64 later.

For reference using qemu-system-aarch64 + linux-5.6.4 + 64KB page to test
cifs read, this patch can improve cifs read performance:
with patch: read throughput 39 MB/s, SMB read IO size 4MB
/ # dd if=3D/mnt/cifs/1G.img of=3D/dev/null bs=3D4M count=3D256
256+0 records in
256+0 records out
1073741824 bytes (1.0GB) copied, 25.982352 seconds, 39.4MB/s
[~] # strace -p 23934
sendfile(38, 32, [297795584] =3D> [301989888], 4194304) =3D 4194304

without patch: read throughput 18 MB/s, SMB read IO size 16KB
/ # dd if=3D/mnt/cifs/1G.img of=3D/dev/null bs=3D4M count=3D256G
256+0 records in
256+0 records out
1073741824 bytes (1.0GB) copied, 54.367686 seconds, 18.8MB/s
[~] <0> strace -p 15786
sendfile(38, 32, [452984832] =3D> [453001216], 16384) =3D 16384

This link is a easy way to compile aarch64 linux kernel with page size 64KB
, a simple rootfs with busybox, and run it on qemu-system-aarch64:
https://docs.google.com/document/d/1NSVd-dib_asugCZHmZgohLZXHxV25ftzYtUDSpp=
Y3hA/edit?usp=3Dsharing

--
Regards,
Jones Syue | =E8=96=9B=E6=87=B7=E5=AE=97
QNAP Systems, Inc.