GNU bug report logs - #74855
30.0.92; dired - slow copy across (wireless) LAN

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Message #8 received at 74855 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Christopher Howard <christopher <at> librehacker.com>, 74855 <at> debbugs.gnu.org
Cc: Michael Albinus <michael.albinus <at> gmx.de>
Subject: Re: bug#74855: 30.0.92; dired - slow copy across (wireless) LAN
Date: Wed, 18 Dec 2024 23:31:21 -0500

Christopher Howard <christopher <at> librehacker.com> writes:

> Hello. Recently I was using dired to transfer 600 files, with about 2GB data total, across our LAN (one wi-fi hop involved). The source was a local directory, and the target was an SSH host on the LAN. I marked the files I wanted with dired-mark-files-regexp, and then used dired-do-copy to send them to "/ssh:<snip>@<snip>:/home/<snip>/<snip>". This took a really long time. Actually, the copy was still going after about 15 hours (overnight) though I could see it had not frozen up, but was still moving files.
>
> Using scp directly, from Gnome console, I am seeing transfer rates of about 2.5 MB/s over the same path. So, I'm wondering why the large disparity. Could somebody explain further how Emacs goes about moving the file data and where the bottleneck would be. Is there room for improvement in this functionality?

Michael, any comments?

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