Messages in this thread | | | Date | Wed, 8 Feb 2006 06:17:09 +0100 | From | Willy Tarreau <> | Subject | Re: 2.6 vs 2.4, ssh terminal slowdown |
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Hi Grant,
On Wed, Feb 08, 2006 at 03:51:24PM +1100, Grant Coady wrote: > On Wed, 8 Feb 2006 14:00:59 +1100, Con Kolivas <kernel@kolivas.org> wrote: > > >This is the terminal's fault. xterm et al use an algorithm to determine how > >fast your machine is and decide whether to jump scroll or smooth scroll. This > >algorithm is basically broken with the 2.6 scheduler and it decides to mostly > >smooth scroll. > > Strange it does that over localnet to a PuTTY terminal on windoze. > > Seems a strange thing to do in the kernel though, presentation > buffering / management surely can be done in userspace?
I suspect the sshd on the firewall gets woken up for each line and it behaves exactly like an xterm. After having done a lot of "ls -l|cat" on 2.6, I'm not surprized at all :-/
A good test would be to strace sshd under 2.4 and 2.6. You could even use strace -tt. Probably that you will see something like 1 ms between two reads on 2.6 and nearly nothing between them in 2.4.
> Grant.
Cheers, Willy
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