Re: [ckrm-tech] Re: [RFC] Revised CKRM release

Alex Lyashkov
2004-05-02T12:28:44Z

В Сбт, 01.05.2004, в 17:46, Herbert Poetzl пишет:
> On Sat, May 01, 2004 at 09:10:15AM +0300, Alex Lyashkov wrote:
> > ? ???, 01.05.2004, ? 02:43, Herbert Poetzl ?????:
> > > On Fri, Apr 30, 2004 at 06:17:39PM -0400, Jeff Dike wrote:
> > > > nagar@watson.ibm.com said:
> > > > > Jeff, do you have any numbers for UML overhead in 2.6 ?
> > > >
> > > > It obviously depends on the workload, but for "normal" things, like kernel
> > > > builds and web serving, it's generally in the 20-30% range. That can be
> > > > reduced, since I haven't spent too much time on tuning. I'm aiming for the
> > > > teens, and I don't think that'll be too hard.
> > >
> > > hmm, just wanted to mention that linux-vserver has
> > > around 0% overhead and often allows to improve
> > > performance due to resource sharing ...
> > >
> > Herber please not say vserver have - 0 overhead.
> > it generally wrong.
>
> well, I said around 0%, but it's actually a long time
> since we measured that, and I'll schedule some
> tests next week, to see if the overhead is still
> not measureable with 'normal' userspace testing
>
Try compare system with 10 vsevers with with 1000 iptables rules per
vserver and routing tables who has more one then one record :) and
system without vservers with same setings ( 1000 iptables rules and some
roting table). Other point who been slowly in vserver large sockets
lists - try use 1000 simultaneous tcp connections per vserver .....
and other... :)
without iptables and 1-10 tcp connections per vserver you can`t find a
speed decrease.

Also fix bugs with wrong selected source address for packets who send
from vserver.

>
> > But overhead less than UML is right.
>
> that is for sure, and it benefits from not having
> everything twice, like inode cache, dentry cache,
> page cache ...
>
> best,
> Herbert
>
> > > basically it's a soft partitioning concept based on
> > > 'Security Contexts' which allow to create many
> > > independant Virtual Private Servers (VPS), which
> > > act simultaneously on one box at full speed, sharing
> > > the available hardware resources.
> > >
> > > see http://linux-vserver.org for details ...
> > >
> > > best,
> > > Herbert
> > >
> > > PS: UML and Linux-VServer play together nicely ...
> > >
> > > >
> > > > Jeff
> > > >
> > > > -------------------------------------------------------
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> > Alex Lyashkov <shadow@psoft.net>
> > PSoft
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Alex Lyashkov <shadow@psoft.net>
PSoft