Subject: Re: rsync very slow, but not a network issue
From: "Steven Hartland" <[email-masked]>
To: <[email-masked]>, <[email-masked]>
Cc: <[email-masked]>
Date: Fri, 16 Jul 2004 02:33:25 +0100

----- Original Message ----- 
From: "Alexis Gallagher" 

I've repeated your tests with a P4 2.4Ghz windows XP using SFU
and a PIII 800Mhz running FreeBSD 5.1

> %[local copy, target file is different ]
> %time rsync test1.mp3 test2.mp3
> 
> real 0m6.422s
> user 0m0.430s
> sys  0m1.431s

P4: time rsync test1.mp3 test2.mp3
real    0m1.906s
user    0m0.344s
sys     0m0.343s
P3:time rsync test1.mp3 test2.mp3
real    0.380u 
user   0.233s 
sys    0:00.81

> %[local copy, target file is the same ]
> %time rsync test1.mp3 test1-same.mp3
> 
> real 0m6.523s
> user 0m0.300s
> sys  0m1.261s

P4(SFU): time rsync test1.mp3 test2.mp3
real    0m0.906s
user    0m0.500s
sys     0m0.157s

P4(cygwin): time rsync test1.mp3 test2.mp3
real    0m26.005s
user    0m1.060s
sys     0m3.732s

P3:time rsync test1.mp3 test2.mp3
real    0.326u 
user   0.264s
user   0:00.72

> %cp test2.bak test2.mp3
> %[network copy, a pure copy with scp for benchmark]
> %time scp test2.mp3 $TEST:
> 
> 260.6KB/s (calculated average)
> real 0m16.257s
> user 0m0.510s
> sys  0m1.091s

P4(SFU)->P3:
4.5MB/s
real    0m3.188s
user    0m1.312s
sys     0m0.438s
P4(cygwin)->P3:
2.6MB/s
real    0m4.433s
user    0m0.639s
sys     0m0.561s

P3->P4
5.3MB/s:
real   1.356u 
user   0.439s 
sys    0:05.38

[network copy, ftp]
P3 -> P4
10.85 MB/s
P4(windows)->P3
10.85 MB/s
P4(cygwin)->P3
9.43 MB/s

> %[network copy, target file is different ]
> %time rsync test1.mp3 $TEST:test2.mp3
> 
> real 0m13.797s
> user 0m1.421s
> sys  0m1.250s

P3->P4
real 3.652u
user 0.411s
sys  0:05.39
P4(SFU)->P3
real    0m4.516s
user    0m1.968s
sys     0m1.093s
P4(cygwin)->P3
real    0m7.722s
user    0m1.357s
sys     0m1.030s

> 
> % (network copy, files are 100% the same)
> % (repeated twice to guarantee target file is there)
> %time rsync test2.mp3 $TEST:test2.bak
> 
> real 0m28.329s
> user 0m1.390s
> sys  0m4.766s
> 

P4: rsync --version
rsync  version 2.6.0  protocol version 27
OpenSSH_3.7.1p2, SSH protocols 1.5/2.0, OpenSSL 0.9.7c 30 Sep 2003
P3: rsync --version
rsync  version 2.6.0  protocol version 27
OpenSSH_3.6.1p1 FreeBSD-20030423, SSH protocols 1.5/2.0, OpenSSL 0x0090701f

> %rsync --version
> rsync version 2.6.2 protocol version 28
> ssh $TEST rsync --version
> rsync version 2.6.2 protocol version 28
> $ ssh -V
> OpenSSH_3.8.1p1, OpenSSL 0.9.7d 17 Mar 2004
> $ ssh $TEST ssh -V
> OpenSSH_3.7.1p1, SSH protocols 1.5/2.0, Open SSL 0.9.7d 17 Mar 2004
> (but ssh -v reports TEST's sshd server is responding with
> OpenSSH_3.6.1p1+CAN-2003-0693, SSH protocols 1.5/2.0, Open SSL 0x0090702f )
> $ uname -r
> 1.5.10(0.116/4/2)

Result is although the copy is cpu limited in ssh and cygwin ssh is slower
than SFU ssh it doesn't explain the same file test results:
SFU: real    0m0.906s
Cygwin: real    0m26.005s

Strange behaviour noticed. It appears that for each block tested cygwin
is opening a new connection instead of using the current one this could
well be where the performance is being lost as this doesn't happen
under SFU.

    Steve

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