maybe you should check your interfaces for half/full duplex and if there's errors or collisions...
otherwise have a play with vmstat, iostat, mpstat etc - they could point you in a direction to look further, at least it will give you hints to see if the box is actively swapping (have swapped out data and swapping in/out data all the time are quite different, as James kinda mentioned) On Fri, Feb 20, 2009 at 10:57 AM, Kyle <[email protected]> wrote: > Thanks the response and explanation James. > > I get the following, sooo... not _too_ bad I guess from that perspective. > > [k...@bottlenose ~]$ free > total used free shared buffers cached > Mem: 2072908 1987788 85120 0 171084 1096132 > -/+ buffers/cache: 720572 1352336 > Swap: 4192944 112 4192832 > > So I guess I need to look elsewhere as to why my experience is "slow". To > clarify my thinking, my 'slow' experience relates to the Server/Router > routing to/from the hosts behind it. > > Hosts behind the box timeout frequently when contacting the mail server. > Likewise HTTP calls through the box seem unusually slow despite an ADSL2+ > running at ~ 15Kbps D'Load connection (noise margin and attentuation seem in > reasonable levels). Yet an HTTP call from the Server itself loads fairly > quickly. > > 'route' shows what it needs to show. I have only ever read of one param in > sysctl.conf that relates to routing. Where do I start to look? > > ------------------------------------------------------------------------ > Kind Regards > > Kyle > > > > James Polley wrote: > >> >> You haven't mentioned swap though - is your machine eating into swap? >> >> The best solution though is to get more RAM. It's cheap, and it makes >> everything faster. >> >> That is, assuming this is actually your problem.... >> >> On Fri, Feb 20, 2009 at 8:48 AM, Kyle <[email protected]> wrote: >> >>> Hi Slugger's >>> >>> It appears I need a lesson in Linux and memory management. >>> >>> If you could treat this request as if coming from a complete numpty >>> please, and simply explain the differences between Cached, Buffered and >>> Application Memory as they pertain to Linux? >>> >>> According to KDE SysGuard, my CentOS 5.2 server appears to "cache" its >>> entire 2GB quotient of physical RAM. And my general experience of the box >>> (implemented as file server, mail server, firewall and router) is that it is >>> slow. >>> >>> Something tells me it shouldn't be behaving like this? >>> -- >>> ------------------------------------------------------------------------ >>> Kind Regards >>> >>> Kyle >>> >> -- > SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ > Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html > -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
