Re: sqrt 10x slower in 2.0.7-19 than 2.0.6-9 ???

Perry Harrington (pedward@sun4.apsoft.com)
Thu, 1 Oct 1998 14:39:02 -0700 (PDT)

Have you compared the unaligned accesses of before/after
for each of the machines? It's possible that the newer
glibc code has an unaligned access that is being emulated
by the PAL code.

--Perry

> -----------------------------
>
> Appendix 2: /proc/cpuinfo details
>
> Machine 1 (glibc-2.0.7-19.rpm)
> [johns@paranal junk]$ cat /proc/cpuinfo
> cpu : Alpha
> cpu model : EV56
> cpu variation : 0
> cpu revision : 0
> cpu serial number : Linux_is_Great!
> system type : EB164
> system variation : LX164
> system revision : 0
> system serial number : MILO-0000
> cycle frequency [Hz] : 0
> timer frequency [Hz] : 1024.00
> page size [bytes] : 8192
> phys. address bits : 40
> max. addr. space # : 127
> BogoMIPS : 530.57
> kernel unaligned acc : 0 (pc=0,va=0)
> user unaligned acc : 134 (pc=155556b77a0,va=11ffff8c8)
> platform string : N/A
>
> Machine 2 (glibc-2.0.6-9.rpm):
> [johns@avalon2 libm]$ cat /proc/cpuinfo
> cpu : Alpha
> cpu model : EV56
> cpu variation : 0
> cpu revision : 0
> cpu serial number : Linux_is_Great!
> system type : EB164
> system variation : SX164
> system revision : 0
> system serial number : MILO-0000
> cycle frequency [Hz] : 0
> timer frequency [Hz] : 1024.00
> page size [bytes] : 8192
> phys. address bits : 40
> max. addr. space # : 127
> BogoMIPS : 528.48
> kernel unaligned acc : 0 (pc=0,va=0)
> user unaligned acc : 220 (pc=155556dc6b0,va=11ffffc40)
> platform string : N/A
> 

-- 
Perry Harrington       Linux rules all OSes.    APSoft      ()
email: perry@apsoft.com 			Think Blue. /\