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System Performance is low

Hi all,
I am very new to linux and recently i installed fedora 8 in my PC.In the beginning performance is good.However now a days my PC is a bit slow.I was unable to find the reason.Actually there is no anti virus in my system.How can i find that my system got affected with virus and suggest me good anti virus for linux.What is the probability of virus attacks in linux when compared to other OS's.Waiting for your valuable reply.
Thanks

the likelihood that you have a virus is extremely small to non-existent. most likely something is misconfigured or you are having some other system problem. when you say "a bit slow," do you mean the actual OS, or the GUI? it could be a video card/X issue, for example.

One initial thing you could do is run the top utility by typing top in a terminal, and then watching to see what running processes might be using up your CPU cycles.

another thing off the top of my head is that you could check to make sure your disk/s have the right settings, have DMA enabled, etc. hdparm -i /dev/hda or /dev/sda as root should tell you that.

to check memory/swap usage, use the free command (or free -m).

Hi,

These commands are run from the cli.
I would use the 'hdparm -I /dev/your_device' where 'your_device' can be either hda,hdb,hdc, hdd for ide device or sda,sdb,sdc,sdd for SCSI or SATA.

Code:

except from 'man hdparm';

      -i    Display the identification info that was obtained from the drive

              at  boot  time,  if  available.  This is a feature of modern IDE

              drives, and may not be supported by  older  devices.  The  data

              returned  may or may not be current, depending on activity since

              booting the system.  However, the current multiple  sector  mode

              count  is  always  shown.  For a more detailed interpretation of

              the identification info, refer to AT  Attachment  Interface  for

              Disk  Drives  (ANSI ASC X3T9.2 working draft, revision 4a, April

              19/93).



      -I    Request identification info directly from the  drive,  which  is

              displayed in a new expanded format with considerably more detail

              than with the older -i flag.

The 'i' option is used to get drive information that was at boot time with the 'I' getting the information from the drive.

post the outputs

post the outputs of
top ( uptime )
free -o -m
dmesg
df -h

Fedora Acting Sluggish

Have you installed any software recently or do you have enough
Ram? *we need more information to help you
I don't think that it is a virius
There is more virius's for Linux than FanClubs for Bill G
the only problem is that there is no virius's for linux

THE PENGUIN STANDS TALL

By default Fedora comes with a ton of stuff turned on. As this "junk" accumulates stuff (log files, etc) it can cause "issues". You might also want to provide "yum repolist" as about half the issues I see with Fedora are related to mixing repos.