Thanks Saifi .. it really helps .. Regards, Kazi
On Tue, May 19, 2009 at 4:31 PM, Saifi Khan <[email protected]>wrote: > > > On Tue, 19 May 2009, Yakoob, M. Kazi M. wrote: > > > replying your first email ... SAR for system activity report. > > > > not to your detailed reply in your second email. > > > > The result you sent me is my expected result too; but what i think this > > command give a different output in Ubuntu. > > > > I updated the system and still the output is same. > > > > now; i need to know how manually can i calculate %util ... > > > > Thanks in advance ... > > > > Regards, > > Kazi > > > > On my Gentoo machine, i just extracted the source code of > sysstat 8.0.4 > > Here is an excerpt from the FAQ > > Because of a Linux kernel bug, iostat -x may display huge I/O > response times (svctm) and a bandwidth utilization (%util) of > 100% for some devices. > > Indeed these devices have a value for the field #9 (beginning > after the device name) in /proc/{partitions,diskstats} which > is always different from 0, and even negative sometimes. > > Yet this field should go to zero, since it gives the > number of I/Os currently in progress (it is incremented as > requests are submitted, and decremented as they finish). > > To (temporarily) solve the problem, you should reboot your > system to reset the counters in /proc/{partitions,diskstats}. > > working with this macro, > #define S_VALUE(m,n,p) (((double) ((n) - (m))) / (p) * HZ) > > please see the Twincling pastebin for the relevant code, > i've highlighted it for you at > http://twincling.pastebin.com/f67d42ace > > Hope this helps. > > thanks > Saifi. > > [Non-text portions of this message have been removed]
