Date: Sat, 20 Sep 2008 10:23:56 -0700 From: Marcel Moolenaar <xcllnt@mac.com> To: ppc@FreeBSD.org Subject: [AIM] UP vs SMP comparison Message-ID: <7E6A8CC7-2466-453C-AE0D-FB4699974126@mac.com>
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All, Below the "make buildworld" times ran on an UP and a SMP kernel: UP SMP -j1 5:09 5:31 -j2 5:05 3:12 -j4 5:07 3:04 Conclusions: o It appears that CPU is the bottleneck for UP in my setup. o An SMP kernel is 7% slower than an UP kernel. o There's a 1.7x speed-up between -j1 and -j2 for SMP. machine: FreeBSD 8.0-CURRENT #16 r183030:183060M: Mon Sep 15 23:16:32 PDT 2008 marcel@xserve.xcllnt.net:/nfs/freebsd/patch/smp/sys/powerpc/ compile/XSERVE-MP WARNING: WITNESS option enabled, expect reduced performance. cpu0: Motorola PowerPC 7455 revision 2.1, 1000.00 MHz cpu0: HID0 8450c0bc<EMCP,TBEN,NAP,DPM,ICE,DCE,SGE,BTIC,LRSTK,FOLD,BHT> real memory = 526016512 (501 MB) avail memory = 508674048 (485 MB) FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs configuration: /usr/src over NFS using gem(4) /usr/obj local (PCI based ATA controller) gem0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=b<RXCSUM,TXCSUM,VLAN_MTU> ether 00:03:93:a8:cc:16 inet 172.16.4.106 netmask 0xffffff00 broadcast 172.16.4.255 media: Ethernet autoselect (1000baseT <full-duplex>) status: active atapci0: <Promise PDC20270 UDMA100 controller> port 0x1090-0x1097,0x1080-0x1083,0x1070-0x1077,0x1060-0x1063,0x1050-0x105f mem 0x90030000-0x9003ffff irq 58 at device 21.0 on pci1 atapci1: <Promise PDC20270 UDMA100 controller> port 0x1040-0x1047,0x1030-0x1033,0x1020-0x1027,0x1010-0x1013,0x1000-0x100f mem 0x90010000-0x9001ffff irq 63 at device 27.0 on pci1 -- Marcel Moolenaar xcllnt@mac.com
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