Date: Wed, 30 Aug 2023 01:49:54 -0700 From: Mark Millard <marklmi@yahoo.com> To: weh@microsoft.com, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: Very slow scp performance comparing to Linux Message-ID: <FF64898C-2968-4362-81FB-BDA5FE7C4A6B@yahoo.com> In-Reply-To: <D57A4777-DC48-4374-9FB0-43E468DF7D4C@yahoo.com> References: <87B95CDA-1812-44B8-9356-46631DEA9428@yahoo.com> <DF47C0CB-7456-4677-9F41-3FB57D655288@yahoo.com> <D57A4777-DC48-4374-9FB0-43E468DF7D4C@yahoo.com>
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On Aug 30, 2023, at 01:22, Mark Millard <marklmi@yahoo.com> wrote:
> On Aug 30, 2023, at 01:17, Mark Millard <marklmi@yahoo.com> wrote:
>=20
>> On Aug 29, 2023, at 12:52, Mark Millard <marklmi@yahoo.com> wrote:
>>=20
>>> Wei Hu <weh_at_microsoft.com> wrote on
>>> Date: Tue, 29 Aug 2023 12:55:35 UTC :
>>>=20
>>>> Thanks for the update. Seems the numbers are the same on zfs and =
ufs. That's=20
>>>> good to know.=20
>>>>=20
>>>> Yes, your numbers on ARM64 are better than mine on Intel. However, =
my original
>>>> intention was to find out why scp on Linux is performing much =
better than FreeBSD
>>>> under the same hardware env.=20
>>>>=20
>>>> Is it possible to try Linux in your ARM64 setting? I am using =
Ubuntu 22.04 on ext4=20
>>>> file system.
>>>=20
>>>=20
>>> I tried to use the Hyper-V Quick Create on the Windows Dev Kit 2023
>>> to install a Ubuntu 22.04 . (No clue if ext4 would result.) But the
>>> Hyper-V UEFI reports for the disk created:
>>>=20
>>> 1. SCSI Disk 0,0
>>> The boot loader did not load an operating system.
>>>=20
>>> (It then reports the network adapter attempt found no
>>> boot image, but that is expected.)
>>>=20
>>> That leaves me wondering if Hyper-V Quick Create
>>> established a VM file holding Intel/AMD material
>>> despite the aarch64 context.
>>>=20
>>> Establishing a Ubuntu more directly is not familiar and
>>> will have to be a background activity and, so, likely
>>> will not be timely. If I did any experiments outside
>>> Hyper-V (native booting), they would be with slower
>>> USB3 SSD media than I use for FreeBSD.
>>>=20
>>> I did notice that Hyper-V Quick Create did not create
>>> a fixed sized disk but a dynamic sized one. That is
>>> different than what I did for FreeBSD.
>>>=20
>>> Also, it was not obvious if you were after aarch64
>>> Hyper-V testing vs. native-boot testing vs. both. So
>>> I may have gone the wrong direction from the start.
>>> It is possible that I'd find establishing a native-boot
>>> easier and then be able to have a VM file created from
>>> the media, more like what I did with FreeBSD.
>>>=20
>>> The Ubuntu activity likely would not be analogous to
>>> the FreeBSD builds having -mcpu=3D optimization used.
>>>=20
>>> Back to $work.
>>>=20
>>=20
>> I found a sequence of UI operations that worked for
>> installing Ubuntu server 22.04.3 into Hyper-V in
>> Windows 11 Pro on the Windows Dev Kit 2023 via
>> use of a downloaded *.iso .
>>=20
>> The kernel that results predates 6.0:
>>=20
>> $ uname -ap
>> Linux ubwdk23s 5.15.0-82-generic #91-Ubuntu SMP Mon Aug 14 14:19:18 =
UTC 2023 aarch64 aarch64 aarch64 GNU/Linux
>>=20
>> Using my usual rule of rebooting before the first scp:
>>=20
>> $ scp =
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
markmi@localhost:FreeBSD-14-TEST.img
>> . . .
>> =
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
=
100% 5120MB 431.3MB/s 00:11=20
>>=20
>> $ rm FreeBSD-14-TEST.img
>> $ scp =
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
markmi@localhost:FreeBSD-14-TEST.img
>> . . .
>> =
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
=
100% 5120MB 482.2MB/s 00:10
>>=20
>> Definitely faster than the FreeBSD results that I reported
>> earlier, including faster than the ThreadRipper 1950X with
>> Optane in a PCIe slot (more like 300 MiBytes/sec).
>>=20
>> I again used 6 cores, 24576 MiBytes of RAM, a fixed sized virtual =
hard
>> disk under Hyper-V.
>>=20
>> For reference:
>>=20
>> $ lsblk -f
>> NAME FSTYPE FSVER LABEL UUID =
FSAVAIL FSUSE% MOUNTPOINTS
>> loop0 squashfs 4.0 =
0 100% /snap/core20/1977
>> loop1 squashfs 4.0 =
0 100% /snap/lxd/24326
>> loop2 squashfs 4.0 =
0 100% /snap/snapd/19459
>> sda =
=E2=94=9C=E2=94=80sda1 vfat FAT32 F7E9-1344 =
1G 1% /boot/efi
>> =E2=94=94=E2=94=80sda2 ext4 1.0 =
48a0dbe6-5a99-4b6e-92dc-fe6d8efc6ffe 99.3G 14% /
>>=20
>>=20
>>=20
>> An experiment would be to have a small amount if RAM relative
>> the file size. That would force it to actually write to media
>> for some part of the file copy.
>=20
> The wording was poor: "force it" here is just from the
> Ubuntu viewpoint. I make no claim to know if Hyper-V
> is actually writing the material out to media at the
> time vs. later.
>=20
>> So using 1024 MiByte of RAM assigned in Hyper-V:
>>=20
>> $ scp =
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
markmi@localhost:FreeBSD-14-TEST.img
>> . . .
>> =
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
=
100% 5120MB 407.5MB/s 00:12
>>=20
>> $ rm FreeBSD-14-TEST.img
>> $ scp =
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
markmi@localhost:FreeBSD-14-TEST.img
>> . . .
>> =
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
=
100% 5120MB 404.7MB/s 00:12
>>=20
>> Still definitely faster than the FreeBSD results that I
>> reported earlier, including faster than the ThreadRipper
>> 1950X with Optane in a PCIe slot (more like 300 MiBytes/sec).
One more variation in ubuntu under Hyper-V, still with 1024 MiBytes
of assigned RAM: use of localhost:/dev/null
$ scp =
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
markmi@localhost:/dev/null
. . .
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
=
=20
$ scp =
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
markmi@localhost:/dev/null
. . .
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
=
100% 5120MB 492.9MB/s 00:10
The matching FreeBSD examples with 24576 MiBytes of RAM assigned (ZFS =
context):
# scp =
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
root@localhost:/dev/null
. . .
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
=
=20
# scp =
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
root@localhost:/dev/null
. . .
FreeBSD-14.0-ALPHA2-arm-armv7-GENERICSD-20230818-77013f29d048-264841.img =
=
100% 5120MB 198.7MB/s 00:25
Note: At most one VM running at a time, never both in overlapping times.
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
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