hi Rokicki, Changing the value of HZ doesn't seem to affect the system other than the time slice, it seems. Can you tell me the other files, which I should change, if you can remember them ? Also, there are several definitions of HZ in 2.5.73 kernel (such as USER_HZ blah blah). Do ya have any idea how they work ? Thank you very much Sahan ----- Original Message ----- From: "Rokicki, Andrew" <ARokicki@xxxxxxxxxxxxx> Date: Tuesday, August 31, 2004 6:21 pm Subject: RE: Interrupt frequency > > > > If I change the HZ value from 100 to 1000 can I get more > precision ? > > > > What are the things affected ? (I know one thing the 'uptime' is > > affected since it keeps time in jiffies) > > > If you change HZ from 100 to 1000 you will get task slice of 1ms. > This means that a process will run for 1ms before it gives up the > CPU. > On our systems I changed HZ to 4096 this gives a slice time of > 0.25ms( you > have to do minor modifications to some other files to go that low 1000 > should be fine.) > I have not seen any problems and uptime seems to be accurate. > > The systems we use are robotic equipment so we don't do a lot other > thanrunning the machine. > We needed small slice time to drive stepper motors. > > > > > > The information contained in this transmission may contain > privileged and confidential information. > It is intended only for the use of the person(s) named above. If > you are not the intended recipient, > you are hereby notified that any review, dissemination, > distribution or duplication of this communication > is strictly prohibited. If you are not the intended recipient, > please contact the sender by reply email > and destroy all copies of the original message. This communication > is from TI Automotive. > > > _______________________________________________ > Redhat-devel-list mailing list > Redhat-devel-list@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/redhat-devel-list >
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