Date: Thu, 18 Feb 1999 23:24:21 +0100 From: Paul van der Zwan <paulz@trantor.xs4all.nl> To: freebsd-current@FreeBSD.ORG Subject: Slow seq. write on Seagate ST36530N Message-ID: <199902182224.XAA00605@trantor.xs4all.nl>
next in thread | raw e-mail | index | archive | help
I am having some performance problems on my -current ( update last weekend)
I hooked up a new Seagate ST36530N yesterday ( connected to an Adaptec 2940U)
and sequential write is very slow.
Compared to an IBM DORS-32160 connected to the same controller ( even the same
cable) it is half as fast.
Iozone auto shows the following :
Seagate
IOZONE: Performance Test of Sequential File I/O -- V2.01 (10/21/94)
By Bill Norcott
Operating System: FreeBSD 2.x -- using fsync()
IOZONE: auto-test mode
MB reclen bytes/sec written bytes/sec read
1 512 5835553 22369621
1 1024 3627506 33554432
1 2048 3441480 44739242
1 4096 4329604 44739242
1 8192 3121342 67108864
2 512 3627506 22369621
2 1024 4260880 44739242
2 2048 3273603 38347922
2 4096 4067203 67108864
2 8192 4067203 67108864
4 512 4161790 21474836
4 1024 2354696 35791394
4 2048 2418337 38347922
4 4096 2418337 59652323
4 8192 1988410 53687091
8 512 2863311 20259279
8 1024 1565221 37025580
8 2048 1470879 31580641
8 4096 1514445 48806446
8 8192 1337162 56512727
16 512 2041334 14412641
16 1024 1536111 27531841
16 2048 1476948 43826196
16 4096 1410961 48806446
16 8192 1432610 52377649
IBM
MB reclen bytes/sec written bytes/sec read
1 512 3728270 22369621
1 1024 4067203 26843545
1 2048 3947580 67108864
1 4096 3728270 44739242
1 8192 3834792 67108864
2 512 4549753 13421772
2 1024 4194304 44739242
2 2048 3890368 53687091
2 4096 4400581 67108864
2 8192 3677198 67108864
4 512 4129776 21474836
4 1024 3532045 44739242
4 2048 2451465 53687091
4 4096 3016128 59652323
4 8192 2870967 53687091
8 512 2396745 21053761
8 1024 2894182 37025580
8 2048 2587329 42949672
8 4096 2526451 51130563
8 8192 2520520 56512727
16 512 3067833 20069940
16 1024 2701237 34087042
16 2048 3591109 43826196
16 4096 2306641 42949672
16 8192 3121342 52377649
Bonnie shows the following:
Seagate
-------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
100 3251 44.0 1307 4.0 2285 11.5 5006 69.0 8644 23.0 115.1 4.2
IBM
100 3333 45.0 2533 8.8 1878 10.1 4244 58.2 5140 19.7 76.4 3.3
If I interpret it correctly the Seagate is faster in everything but sequential
writes.
dmesg shows the following :
da1 at ahc0 bus 0 target 1 lun 0
da1: <SEAGATE ST36530N 1444> Fixed Direct Access SCSI-2 device
da1: 10.0MB/s transfers (10.0MHz, offset 15), Tagged Queueing Enabled
da1: 6208MB (12715920 512 byte sectors: 255H 63S/T 791C)
da0 at ahc0 bus 0 target 0 lun 0
da0: <IBM DORS-32160 S82C> Fixed Direct Access SCSI-2 device
da0: 10.0MB/s transfers (10.0MHz, offset 15), Tagged Queueing Enabled
da0: 2063MB (4226725 512 byte sectors: 255H 63S/T 263C)
Anybody an idea ??
Paul
--
Paul van der Zwan paulz @ trantor.xs4all.nl
"I think I'll move to theory, everything works in theory..."
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199902182224.XAA00605>