From: Herbert Poetzl (herbert_at_13thfloor.at)
Date: Tue 04 Jan 2005 - 02:55:16 GMT
On Tue, Jan 04, 2005 at 02:45:09AM +0100, Lars E. D. Jensen wrote:
> Hi list
>
> I've installed 3 vservers on a dual xeon (2,8 ghz, 1mb cache) based server
> with 1 GB ram, and 10000 spins scsi disks, currently the vservers/root server
> are not under load. But they will be soon.
>
> I have my doubts about only 1 GB ram in the root server.
>
> I'm using Debian Sarge inside the vservers and it's all running on Debian
> Woody (root server) patched with vserver 1.29 on top of kernel 2.4.28.
>
> What really worries me is that when I'm just testing with ab (apache bench),
> the response of the vservers is periodically very slow and I get a lot of
> failed http requests. And the webpages sometime take 5-10 seconds to load.
> Even with ssh it's sometimes slow, when I ssh to the root server everything
> goes fast (sounds weird to say that ssh goes fast?!).
>
> Here's a dump of ./vserver-stat, vsmon1 is a monitor for PHP applications on
> vswwwe1. vsdbe1 is a mysql databaseserver used by vswwwe1.
>
> CTX PROC VSZ RSS userTIME sysTIME UPTIME NAME DESCRIPTION
> 0 65 384MB 7kB 16h39m58 12h28m21 16d03h06 root server
> 1002 53 1GB 36kB m12.12 m06.11 2h27m50 vsmon1
> 1003 52 1GB 144kB 1m26.78 1m51.37 2h27m38 vswwwe1
> 1004 22 756MB 40kB m12.85 m03.82 9h59m50 vsdbe1
>
> All the vservers is started on eth0 and aliased each with their own public IP.
>
> What could cause this slow behavior?
many things, but it doesn't sound typical for 3 servers
I would try the same thing with 2.6.10/vs1.9.3.16 just
for a comparison ... if this still feels _that_ slow
then the hardware has some issues (i.e. dropping irqs
or going to power save/frequency scaling/etc)
> Is 1 GB ram enough for 3 vservers or should I put like 4-6 GB ?
I would say it's more than enough for 3 vservers, and
using more memory would not really help, but make things
worse (on 2.4 anyway)
HTH,
Herbert
> Thanks.
> --
> Med venlig hilsen / Best regards
>
> Lars E. D. Jensen
> lars_at_dangvard.dk
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