Re: hype(r)threading
Thanks, that´s greatly appreciated. Pete > > On 03-Mar-2003 Petri Helenius wrote: > > After some reading around I ended up putting a return; on top of > > the mptable_hyperthread_fixup function and my performance is back. > > Setting the sysctl helps some but it does not really fix the performance issues. > > > > I would like to make the suggestion of making the HT "fixup" maybe a default > > but allow disabling with a kernel variable? > > I'm going to add a 'HTT' kernel option that I'll backport prior to 4.8. > > > Pete > > > > On Mon, 3 Mar 2003, Petri Helenius wrote: > > > >> > >> I seem to want to quite the opposite what other people would like to happen, > >> we have a supermicro P4DPR board with two Xeon´s. Since lately the kernel seems to > >> want to launch the virtual cores regardless of BIOS setting of HyperThreading > >> being > >> [Disabled]. > >> > >> Any ideas how to disable the cores since our workload is does not benefit from > >> having more than two cores in a machine. > >> > >> Pete > >> > > > > Currently, AFAIK, there is no way to do this. > > > > Depending on what you are doing you can increase performance slightly by > > setting machdep.cpu_idle_hlt=1 > > > > -Trish > > > > -- > > Trish Lynch[EMAIL PROTECTED] > > Ecartis Core Team [EMAIL PROTECTED] > > EFNet IRC Operator @ efnet.demon.co.uk [EMAIL PROTECTED] > > EFNet IRC Operator/SysAdmin @ irc.dkom.at [EMAIL PROTECTED] > > Key fingerprint = 781D 2B47 AA4B FC88 B919 0CD6 26B2 1D62 6FC1 FF16 > > > > > > > > To Unsubscribe: send mail to [EMAIL PROTECTED] > > with "unsubscribe freebsd-current" in the body of the message > > -- > > John Baldwin <[EMAIL PROTECTED]> <>< http://www.FreeBSD.org/~jhb/ > "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ > To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
Re: hype(r)threading
On 03-Mar-2003 Petri Helenius wrote: > After some reading around I ended up putting a return; on top of > the mptable_hyperthread_fixup function and my performance is back. > Setting the sysctl helps some but it does not really fix the performance issues. > > I would like to make the suggestion of making the HT "fixup" maybe a default > but allow disabling with a kernel variable? I'm going to add a 'HTT' kernel option that I'll backport prior to 4.8. > Pete > > On Mon, 3 Mar 2003, Petri Helenius wrote: > >> >> I seem to want to quite the opposite what other people would like to happen, >> we have a supermicro P4DPR board with two Xeon´s. Since lately the kernel seems to >> want to launch the virtual cores regardless of BIOS setting of HyperThreading being >> [Disabled]. >> >> Any ideas how to disable the cores since our workload is does not benefit from >> having more than two cores in a machine. >> >> Pete >> > > Currently, AFAIK, there is no way to do this. > > Depending on what you are doing you can increase performance slightly by > setting machdep.cpu_idle_hlt=1 > > -Trish > > -- > Trish Lynch[EMAIL PROTECTED] > Ecartis Core Team [EMAIL PROTECTED] > EFNet IRC Operator @ efnet.demon.co.uk [EMAIL PROTECTED] > EFNet IRC Operator/SysAdmin @ irc.dkom.at [EMAIL PROTECTED] > Key fingerprint = 781D 2B47 AA4B FC88 B919 0CD6 26B2 1D62 6FC1 FF16 > > > > To Unsubscribe: send mail to [EMAIL PROTECTED] > with "unsubscribe freebsd-current" in the body of the message -- John Baldwin <[EMAIL PROTECTED]> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
Re: hype(r)threading
After some reading around I ended up putting a return; on top of the mptable_hyperthread_fixup function and my performance is back. Setting the sysctl helps some but it does not really fix the performance issues. I would like to make the suggestion of making the HT "fixup" maybe a default but allow disabling with a kernel variable? Pete On Mon, 3 Mar 2003, Petri Helenius wrote: > > I seem to want to quite the opposite what other people would like to happen, > we have a supermicro P4DPR board with two Xeon´s. Since lately the kernel seems to > want to launch the virtual cores regardless of BIOS setting of HyperThreading being > [Disabled]. > > Any ideas how to disable the cores since our workload is does not benefit from > having more than two cores in a machine. > > Pete > Currently, AFAIK, there is no way to do this. Depending on what you are doing you can increase performance slightly by setting machdep.cpu_idle_hlt=1 -Trish -- Trish Lynch[EMAIL PROTECTED] Ecartis Core Team [EMAIL PROTECTED] EFNet IRC Operator @ efnet.demon.co.uk [EMAIL PROTECTED] EFNet IRC Operator/SysAdmin @ irc.dkom.at [EMAIL PROTECTED] Key fingerprint = 781D 2B47 AA4B FC88 B919 0CD6 26B2 1D62 6FC1 FF16 To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
Re: hype(r)threading
On Mon, 3 Mar 2003, Petri Helenius wrote: > > I seem to want to quite the opposite what other people would like to happen, > we have a supermicro P4DPR board with two Xeon´s. Since lately the kernel seems to > want to launch the virtual cores regardless of BIOS setting of HyperThreading being > [Disabled]. > > Any ideas how to disable the cores since our workload is does not benefit from > having more than two cores in a machine. > > Pete > Currently, AFAIK, there is no way to do this. Depending on what you are doing you can increase performance slightly by setting machdep.cpu_idle_hlt=1 -Trish -- Trish Lynch[EMAIL PROTECTED] Ecartis Core Team [EMAIL PROTECTED] EFNet IRC Operator @ efnet.demon.co.uk[EMAIL PROTECTED] EFNet IRC Operator/SysAdmin @ irc.dkom.at [EMAIL PROTECTED] Key fingerprint = 781D 2B47 AA4B FC88 B919 0CD6 26B2 1D62 6FC1 FF16 To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
hype(r)threading
I seem to want to quite the opposite what other people would like to happen, we have a supermicro P4DPR board with two Xeon´s. Since lately the kernel seems to want to launch the virtual cores regardless of BIOS setting of HyperThreading being [Disabled]. Any ideas how to disable the cores since our workload is does not benefit from having more than two cores in a machine. Pete To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
