Date: Mon, 27 Jan 1997 20:52:47 +1100 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, michaelh@cet.co.jp Cc: dicen@hooked.net, freebsd-hackers@freebsd.org Subject: Re: What is the default for async in /etc/fstab? Message-ID: <199701270952.UAA32722@godzilla.zeta.org.au>
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>> In my tests, ext2fs is fastest for huge sequential i/o's when the block
>> sizes are closer (8K vs 4K), but there was only a small difference (less
>> than 10%) between the best and worst cases (best: ext2fs under FreeBSD,
>> next: ext2fs under Linux, worst: ext2fs under Linux) except for rewrite,
>
>next: and worst: are the same here. ;-)
Oops. worst: ufs under FreeBSD. Here is the data.
Environment:
- ASUS P5/133, 32MB, 2.1GB Quantum FireballTM IDE drive with identical
configurations under FreeBSD and Linux (16 sectors/interrupt, 32-bit i/o,
PIO mode 4).
- all on the same empty partition (except mke2fs puts lost+found there)
at offset about 320MB and size about 1024MB.
- I thought I used the same block size of 4K in all cases, but some of
my notes say that I used 8K for ufs. The ufs fragment size was certainly
not 4K as it should have been to match the ext2fs fragment size.
bonnie.ext2fs-under-freebsd-current (fs block size 4K)
-----------------------------------
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
512 3786 71.8 5220 18.7 1556 9.1 3904 70.7 5204 14.5 47.6 2.8
bonnie.ext2fs-under-linux-2.0.20 (fs block size 4K)
--------------------------------
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
512 3836 96.2 4517 25.0 2500 35.0 3488 91.2 5156 19.8 44.8 2.0
bonnie.ufs-under-freebsd-current (fs block/frag size 8K/1K or 4K/?)
--------------------------------
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
512 3543 70.9 4627 19.1 1459 8.1 3891 70.5 4875 13.4 45.0 2.6
Bruce
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