[Bug 1337] SCP performance twice as slow as RCP
bugzilla-daemon at bugzilla.mindrot.org
bugzilla-daemon at bugzilla.mindrot.org
Fri Jul 13 20:47:07 EST 2007
http://bugzilla.mindrot.org/show_bug.cgi?id=1337
Pádraig Brady <P at draigBrady.com> changed:
What |Removed |Added
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CC| |P at draigBrady.com
--- Comment #2 from Pádraig Brady <P at draigBrady.com> 2007-07-13 20:47:03 ---
I had to comment on such a nice bug number :)
Darren, in relation to your point 4 above, will it help the following?
I noticed that for scp if you disable compression (yes disable),
then transfer rate increases a lot. I looked at it very quickly
and it seemed worse the more the data compressed.
Also Protocol=1 seems much better:
dd bs=1M count=50 if=/dev/zero of=50MB_zeros
dd bs=1M count=50 if=/dev/urandom of=50MB_random
$ scp localhost:50MB_random /tmp
50MB_random 100% 50MB 10.0MB/s
00:05
$ scp -C localhost:50MB_random /tmp
50MB_random 100% 50MB 4.6MB/s
00:11
$ scp -C localhost:50MB_zeros /tmp
50MB_zeros 100% 50MB 2.3MB/s
00:22
#setting Protocol=1 in sshd_config I get the following speed:
$ scp -C localhost:50MB_zeros /tmp #Includes time to type password!
50MB_zeros 100% 50MB 12.5MB/s
00:04
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