Date: Mon, 21 Jun 1999 09:00:59 -0700 (PDT) From: John Polstra <jdp@polstra.com> To: alpha@freebsd.org Subject: Significant speedups from -mcpu=ev56 Message-ID: <XFMail.990621090059.jdp@polstra.com>
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I spent a little time over the weekend trying to make my Alpha go
faster. I found that adding "-mcpu=ev56" gives a nice improvement
in "make buildworld" times. In all cases, CFLAGS also contained the
usual "-O -pipe".
Without -mcpu=ev56: 6570.76 real 4855.53 user 963.15 sys
With -mcpu=ev56: 5913.08 real 4156.91 user 991.84 sys
These builds were under the same kernel, which was compiled without
"-mcpu=ev56". Using the option to build the kernel might help even
more.
The ~30-second increase in sys time seems to be repeatable. I don't
understand it, and wonder if it might be caused by a tallying error of
some kind.
Here are the hardware details:
FreeBSD 4.0-CURRENT #1: Fri May 28 11:09:40 PDT 1999
jdp@alpha.polstra.com:/a/src/sys/compile/ALPHA
EB164
Digital AlphaPC 164LX 533 MHz, 531MHz
8192 byte page size, 1 processor.
CPU: EV56 (21164A) major=7 minor=2 extensions=0x1<BWX>
OSF PAL rev: 0x1000100020116
real memory = 132276224 (129176K bytes)
avail memory = 124207104 (121296K bytes)
...
ncr0: <ncr 53c875 fast20 wide scsi> irq 1 at device 7.0 on pci0
ncr0: interrupting at CIA irq 1
...
da0 at ncr0 bus 0 target 0 lun 0
da0: <IBM DDRS-39130D DC1B> Fixed Direct Access SCSI-2 device
da0: 40.000MB/s transfers (20.000MHz, offset 15, 16bit), Tagged Queueing Enabled
da0: 8715MB (17850000 512 byte sectors: 255H 63S/T 1111C)
The src and obj trees are in the same filesystem, and soft-updates
is enabled there.
It's still a _lot_ slower than my PII/400 (3394.29 real 2370.84 user
506.85 sys).
John
---
John Polstra jdp@polstra.com
John D. Polstra & Co., Inc. Seattle, Washington USA
"Self-interest is the aphrodisiac of belief." -- James V. DeLong
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