Date: Wed, 30 Aug 2023 23:16:52 -0700 From: Mark Millard <marklmi@yahoo.com> To: Mark Saad <nonesuch@longcount.org> Cc: Wei Hu <weh@microsoft.com>, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: Very slow scp performance comparing to Linux [dd to /dev/null shows substantial FreeBSD vs. Ubuntu differences for bs=1k (or 1K) and bs=512] Message-ID: <B84E85AB-B473-4177-8B80-03BECB8C524E@yahoo.com> In-Reply-To: <SI2P153MB0441F1DBE0BB218517B0DEBABBE5A@SI2P153MB0441.APCP153.PROD.OUTLOOK.COM> References: <2D466F3C-527C-4EE1-8C3D-3E8CDD8D547F@yahoo.com> <543FBABC-C75A-4AB0-BFB6-1C7C15ECBA4E@longcount.org> <96A99928-4E8E-4AB1-BF3A-D026B280EC0E@yahoo.com> <SI2P153MB0441F1DBE0BB218517B0DEBABBE5A@SI2P153MB0441.APCP153.PROD.OUTLOOK.COM>
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On Aug 30, 2023, at 20:59, Wei Hu <weh@microsoft.com> wrote: >> -----Original Message----- >> From: Mark Millard <marklmi@yahoo.com> >> Sent: Thursday, August 31, 2023 10:18 AM >> To: Mark Saad <nonesuch@longcount.org> >> Cc: Wei Hu <weh@microsoft.com>; FreeBSD Hackers <freebsd- >> hackers@freebsd.org> >> Subject: Re: Very slow scp performance comparing to Linux [dd to = /dev/null >> shows substantial FreeBSD vs. Ubuntu differences for bs=3D1k (or 1K) = and >> bs=3D512] >>=20 >> On Aug 30, 2023, at 18:45, Mark Saad <nonesuch@longcount.org> wrote: >>=20 >>> All >>> Why not take scp out of the picture and try iperf? Why , we could be = looking >> at rss by default in Linux . >=20 > Actually I did the iperf3 test as well and posted results a couple = days ago.=20 > Pasting here: >=20 > FreeBSD iperf3 to localhost, single stream: 30.9 Gb/s=20 > Linux iperf3 to localhost, single stream: 48.8 Gb/s I'll note that (48.8Gb/s) / (30.9Gb/s) is a much smaller ratio than then either of the originally reported Ubuntu/FreeBSD ratios: (550 MB/s) / (70 MB/s) or: (350 MB/s) / (70 MB/s) Suggesting one or more non-network issues are contributing, especially vs. the localhost test that had the 550/70 ratio. > Neither of them has any tcp retry.=20 >=20 > Both VMs run on Intel(R) Xeon(R) Platinum 8473C (2100.00-MHz K8-class = CPU).=20 > The FreeBSD VM is 16 vcpu, with 128 GB memory. > The Linux VM is 4 vcpu, with 32 GB memory. >=20 > Wei >=20 >=20 >>=20 >> . . . =3D=3D=3D Mark Millard marklmi at yahoo.com
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