Date: Thu, 31 Aug 2023 07:55:48 +0000 From: Wei Hu <weh@microsoft.com> To: Mark Millard <marklmi@yahoo.com>, Mark Saad <nonesuch@longcount.org> Cc: 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: <SI2P153MB04416934796C4BC8A5A99D1CBBE5A@SI2P153MB0441.APCP153.PROD.OUTLOOK.COM> In-Reply-To: <B84E85AB-B473-4177-8B80-03BECB8C524E@yahoo.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> <B84E85AB-B473-4177-8B80-03BECB8C524E@yahoo.com>
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> -----Original Message----- > From: Mark Millard <marklmi@yahoo.com> > Sent: Thursday, August 31, 2023 2:17 PM > 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/nul= l > shows substantial FreeBSD vs. Ubuntu differences for bs=3D1k (or 1K) and > bs=3D512] >=20 > On Aug 30, 2023, at 20:59, Wei Hu <weh@microsoft.com> wrote: >=20 > >> -----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] > >> > >> On Aug 30, 2023, at 18:45, Mark Saad <nonesuch@longcount.org> wrote: > >> > >>> All > >>> Why not take scp out of the picture and try iperf? Why , we could be > >>> looking > >> at rss by default in Linux . > > > > Actually I did the iperf3 test as well and posted results a couple days= ago. > > Pasting here: > > > > FreeBSD iperf3 to localhost, single stream: 30.9 Gb/s Linux iperf3 to > > localhost, single stream: 48.8 Gb/s >=20 > 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: >=20 > (550 MB/s) / (70 MB/s) > or: > (350 MB/s) / (70 MB/s) >=20 > Suggesting one or more non-network issues are contributing, especially vs= . the > localhost test that had the 550/70 ratio. >=20 Yes, the network perf gap is not as big as I originally thought. Seems diff= erent factors contribute to the slowness of scp on FreeBSD. Network stack is only= one of them. Wei
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