note that there are some issues with this befor sles8 service pack 3. with it enabled, it can lock your guest during very long i/o's.
I've heard of it happening with the creation of large tars. with us, it was running verifies against a 70gig database. > -----Original Message----- > From: Hall, Ken (IDS ECCS) [mailto:[EMAIL PROTECTED] > Sent: Thursday, December 04, 2003 10:45 AM > To: [EMAIL PROTECTED] > Subject: Re: k_timer for SLES8 > > > In the SLES7 2.4.7 kernel, the "timer patch" added an option > called (IIRC) "hz_timer" to the kernel that could be enabled > at kernel build time. SuSE supplied two different kernels, > one with the > feature enabled, the other disabled. > > The patch was enhanced somewhere between 2.4.7 and 2.4.19 > (SLES8) to allow it to be turned on and off via a file in > /proc (/proc/sys/kernel/hz_timer, to be exact). Putting a 1 > in this file DISABLES > the timer, putting in a 0 ENABLES it. As distributed, it > defaults to "1" (DISABLED). > > sysctl and /etc/sysctl.conf just provide a "simple" mechanism > for setting this and other kernel variables at boot time. > I've found that it often doesn't work though, and haven't > been able to figure > out why. > > > -----Original Message----- > > From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of > > Kevin Ellsperman > > Sent: Thursday, December 04, 2003 11:31 AM > > To: [EMAIL PROTECTED] > > Subject: [LINUX-390] k_timer for SLES8 > > > > > > Maybe I've been working under a misperception. I always > > thought that the > > k_timer patch from SLES 7 was incorporated into SLES 8. If I > > am reading > > the listserv correctly, the patch is in SLES8 but not > turned on? I've > > searched the web for any information I can about this and > > have turned up > > nil. I did find a page at IBM in the developerworks area > > talking about > > some perfermance tools that mentions turning the mh_timer in > > /proc/sys/kernel on and off via sysctl -w kernel.hz_timer=0. > > Has anybody > > seen any documentation on the time patch for SLES 8? TIA! > > > > Kevin Ellsperman > > Payless ShoeSource, Inc. > > 785-559-6326 > > >
