Date: Fri, 25 Apr 2003 09:06:08 -0700 From: "jeev" <jeev@boldinternet.net> To: "'Petri Helenius'" <pete@he.iki.fi> Cc: freebsd-smp@freebsd.org Subject: RE: Dual 2.40ghz xeon w/hyperthreading Message-ID: <000301c30b44$95bc4090$0200a8c0@mainframe> In-Reply-To: <3EA91BBA.9080104@he.iki.fi>
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Which would give me the best performance? To disable hyperthreading or enable machdep.cpu_idle_hlt, and if I were to enable it, it would be = from loader.conf or? j -----Original Message----- From: owner-freebsd-smp@freebsd.org = [mailto:owner-freebsd-smp@freebsd.org] On Behalf Of Petri Helenius Sent: Friday, April 25, 2003 4:28 AM To: jeev Cc: freebsd-smp@freebsd.org Subject: Re: Dual 2.40ghz xeon w/hyperthreading jeev wrote: >Basically guys, this box is not exceeding an ide computer I have on = idea. > >I noticed the dual xeon to be slow. So I ran: > >dd if=3D/dev/urandom of=3D/dev/null bs=3D1m count=3D1024 > >on 2 servers, 1 is the top one and 1 is the xeon. >Obviously the ide killed the scsi with dual cpu's running = hyperthreading, >why? > =20 > Hypethreading gives you two virtual CPU's out of one real one. They = perform at ~60-70% of the capacity of real one. Enable machdep.cpu_idle_hlt (disabled by default on SMP) to have the=20 other virtual core to execute HLT when it's not doing anything useful except = busylooping, which is what happens now. Or even better, disable hypethreading to recover real performance. Pete > >-SINGLE 2.4ghz p4 w/1gb ram and 80gig ide > >1073741824 bytes transferred in 266.387823 secs (4030747 bytes/sec) >2.4ghz >CPU: Intel(R) Pentium(R) 4 CPU 2.40GHz (2399.74-MHz 686-class CPU) > Origin =3D "GenuineIntel" Id =3D 0xf27 Stepping =3D 7 >=20 >Features=3D0xbfebf9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MC= A,CMO V >,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> >real memory =3D 1073676288 (1048512K bytes) >avail memory =3D 1039519744 (1015156K bytes) >ad0: 76319MB <WDC WD800JB-00DUA1> [155061/16/63] at ata0-master UDMA100 >----------------------- > > > >-dual 2.4ghz xeon each with hyperthreading, 2gb ram ddr, 73gb scsi hd. > >1073741824 bytes transferred in 410.476271 secs (2615844 bytes/sec) >CPU: Intel(R) Xeon(TM) CPU 2.40GHz (2395.92-MHz 686-class CPU) > Origin =3D "GenuineIntel" Id =3D 0xf27 Stepping =3D 7 >Features=3D0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,P= GE,MC A >,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> > Hyperthreading: 2 logical CPUs >real memory =3D 2146959360 (2096640K bytes) >avail memory =3D 2085502976 (2036624K bytes) >Programming 24 pins in IOAPIC #0 >IOAPIC #0 intpin 2 -> irq 0 >Programming 24 pins in IOAPIC #1 >Programming 24 pins in IOAPIC #2 >Programming 24 pins in IOAPIC #3 >Programming 24 pins in IOAPIC #4 >FreeBSD/SMP: Multiprocessor motherboard > cpu0 (BSP): apic id: 0, version: 0x00050014, at 0xfee00000 > cpu1 (AP): apic id: 6, version: 0x00050014, at 0xfee00000 > cpu2 (AP): apic id: 1, version: 0x00050014, at 0xfee00000 > cpu3 (AP): apic id: 7, version: 0x00050014, at 0xfee00000 > io0 (APIC): apic id: 2, version: 0x00178020, at 0xfec00000 > io1 (APIC): apic id: 3, version: 0x00178020, at 0xfec80000 > io2 (APIC): apic id: 4, version: 0x00178020, at 0xfec80400 > io3 (APIC): apic id: 5, version: 0x00178020, at 0xfec81000 > io4 (APIC): apic id: 8, version: 0x00178020, at 0xfec81400 >da0 at ahc0 bus 0 target 0 lun 0 >da0: <SEAGATE ST373307LC 0004> Fixed Direct Access SCSI-3 device=20 >da0: 160.000MB/s transfers (80.000MHz, offset 63, 16bit), Tagged = Queueing >Enabled >da0: 70007MB (143374744 512 byte sectors: 255H 63S/T 8924C) > >what could be causing this issue? > >Thanks! > >j > >_______________________________________________ >freebsd-smp@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-smp >To unsubscribe, send any mail to "freebsd-smp-unsubscribe@freebsd.org" > =20 > _______________________________________________ freebsd-smp@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-smp To unsubscribe, send any mail to "freebsd-smp-unsubscribe@freebsd.org"
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