On Sat, Nov 12, 2005 at 06:37:11PM +1100, Peter Jeremy wrote: > On Sat, 2005-Nov-12 16:18:15 +0900, Pyun YongHyeon wrote: > >I encountered a P3 SMP system that shows poor fdc(4) performance. > >But when I use larger block size, say 36b, it seems it works > >as expected. > > 36b is one track. My suspicion is that the system isn't fast enough > to read sequential blocks, one at a time, so you're forced to wait > a complete revolution (plus a bit) for each block you read. >
Yes, it could be. But I think the machine is fast enough to read sequential blocks. Part of dmesg shows: CPU: Intel Pentium III (800.03-MHz 686-class CPU) Origin = "GenuineIntel" Id = 0x686 Stepping = 6 Features=0x387fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,P AT,PSE36,PN,MMX,FXSR,SSE> real memory = 402587648 (383 MB) avail memory = 384385024 (366 MB) FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs cpu0 (BSP): APIC ID: 0 cpu1 (AP): APIC ID: 1 And I think I got much better result on slow i386 machines except this one. -- Regards, Pyun YongHyeon _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
