On Wed, May 03, 2000 at 11:46:11AM -0700, you [Gregor Mosheh] claimed:
>
> First off:
> Thank you, Sami, for getting SSH2 to work on my system. It took Sami about
> a month, but he finally fixed a strange problem I'd been having with
> hostbased auth. Hopefully the official patches will be out soon.
>
>
> I currently run backups to our tape server via rsh, and I'd like to use
> SSH instead. I have it working in a test environment, but the performance
> is very slow. Perhaps I'm missing something? The FAQ mentioned using
> blowfish instead of 3DES, but this made no difference.
>
> My test platform is SPARC 5 running Solaris. Slightly old hardware, yes,
> but at least par with the 486s and low-end 586s discussed in the "Should I
> turn off encryption?" section of the FAQ. This FAQ section mentions the
> RC4 cipher as being quite fast, though RC4 isn't implemented in (my
> install of) SSH2 and that cipher may have been retired.
>
> As a test, I use these:
> tar cvf - /usr/local | rsh kenny -l gregor "cat > foo.tar"
> tar cvf - /usr/local | ssh kenny -l gregor -c blowfish "cat > foo.tar"
>
> With RSH, 170 MB backs up in 5 minutes. This comes out to 34 MB per minute
> or 568 kBps, or 32 minutes per GB.
>
> With SSH, the same 170 MB backs up in 19 minutes. This is 9 MB per minute,
> 150 kBps, or 111 minutes per GB.
One thing you could do is to observe the cpu usage of ssh (in both client
and server end) with for example time(1) or top(1). If it tends to take
nearly 100% then the process is propably limited by the ability of your
hardware to encrypt data fast enough, and there is nothing you can do
about it.
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