From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from pb-smtp20.pobox.com ([173.228.157.52]) by ewsd; Thu Apr 23 22:58:53 EDT 2020
Received: from pb-smtp20.pobox.com (unknown [127.0.0.1])
	by pb-smtp20.pobox.com (Postfix) with ESMTP id A898CCFA1B
	for <9front@9front.org>; Thu, 23 Apr 2020 22:58:38 -0400 (EDT)
	(envelope-from unobe@cpan.org)
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=pobox.com; h=date
	:mime-version:content-type:content-transfer-encoding:subject:to
	:from:message-id; s=sasl; bh=FiVqXvOVSyIx8i53hd0BOknxD84=; b=Pao
	aCil5RDzKAMU17Enoyk5pDWnB96s5puu3bBxYa+UImUDbF2t+9GyDAaQQW9SHLNj
	Cf33n7NBm5e/pvyl+cWNv15ULfG60WZmzHjEPk/Bj1hiE+IUjvJ8cEfrK8508AQW
	AmzF+4rIC9KSD1ifaos/igQECODRQzboOCSD0TL8=
Received: from pb-smtp20.sea.icgroup.com (unknown [127.0.0.1])
	by pb-smtp20.pobox.com (Postfix) with ESMTP id A1658CFA1A
	for <9front@9front.org>; Thu, 23 Apr 2020 22:58:38 -0400 (EDT)
	(envelope-from unobe@cpan.org)
Received: from [10.0.1.31] (unknown [137.25.138.56])
	(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
	(No client certificate requested)
	by pb-smtp20.pobox.com (Postfix) with ESMTPSA id 11EB2CFA19
	for <9front@9front.org>; Thu, 23 Apr 2020 22:58:36 -0400 (EDT)
	(envelope-from unobe@cpan.org)
Date: Fri, 24 Apr 2020 02:58:33 +0000
MIME-Version: 1.0
Content-Type: text/plain;
 charset=utf-8
Content-Transfer-Encoding: quoted-printable
Subject: Slow cp, support for 9P2000.s
To: 9front@9front.org
From: Romano <unobe@cpan.org>
Message-ID: <2DE413B1-B05D-45EF-A08A-6F9F119FB745@cpan.org>
X-Pobox-Relay-ID:
 7DA86F26-85D7-11EA-90EE-B0405B776F7B-09620299!pb-smtp20.pobox.com
List-ID: <9front.9front.org>
List-Help: <http://lists.9front.org>
X-Glyph: ➈
X-Bullshit: SSL over AJAX out-scaling NoSQL controller 

On my local wireless network at home between my work laptop and my rpi 4, I=
 tested using 'cp' while in drawterm=2E  I ran drawterm -G on my rpi, and u=
sed srvfs to export its file system=2E I ran drawterm on my work laptop, an=
d mounted the exported filesystem as /n/pi=2E  I then timed a 20MB file fro=
m /mnt/term/root/ on my work laptop to the /n/pi: 0=2E20u 0=2E82s 70=2E14r=
=2E 70s is atrociously slow for a local copy when compared to http or scp, =
so I decided to look to see if this was known and if any work had been done=
 on this problem for 9p=2E  I came across John Floren's thesis from 2010[1]=
 and his testing showed that increased latency over 9p significantly increa=
sed the time files took to transfer=2E He also shows modifications to 'cp' =
and 'exportfs' to allow for streams to make 9p have similar speeds as http=
=2E=20

So considering Floren's research, I then decided to look at my latency on =
my local network, and sure enough, I'm getting the following ping results (=
for 144 packets transmitted, with 1 packet lost): round-trip min/avg/max/st=
ddev =3D 2=2E273/15=2E264/497=2E869/44=2E018 ms =2E With an average latency=
 of 15ms, the time it took for  20MB file to transfer over 9p roughly match=
es Floren's tests=2E

I think that modifying 'cp' and 'exportfs' would resolve this problem and =
will look at patching it per Floren's thesis to confirm=2E  Would modifying=
 'cp' and 'exportfs' to allow for streams be something others would be inte=
rested in? Or has this already been discussed and the stream solution been =
found wanting for some technical reason? The protocol, as mentioned in the =
paper, is called 9P2000=2Es=2E I don't see that flavor listed here: http://=
9p=2Ecat-v=2Eorg/implementations

[1] https://pdfs=2Esemanticscholar=2Eorg/9b47/22e251df61b4abbe0da61720e57a=
c7b62f61=2Epdf