Date: Fri, 19 Feb 1999 07:12:09 +0100 From: Andreas Klemm <andreas@klemm.gtn.com> To: Paul van der Zwan <paulz@trantor.xs4all.nl> Cc: freebsd-current@FreeBSD.ORG, scsi@FreeBSD.ORG Subject: Re: Slow seq. write on Seagate ST36530N Message-ID: <19990219071209.B35927@titan.klemm.gtn.com> In-Reply-To: <199902182224.XAA00605@trantor.xs4all.nl>; from Paul van der Zwan on Thu, Feb 18, 1999 at 11:24:21PM %2B0100 References: <199902182224.XAA00605@trantor.xs4all.nl>
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Sounds familiar to me. I had trouble with a Seagate Wide scsi harddisk in a HP Kajak. First thought it's the NCR. Repllaces it with a AHA 2940UW. Nothing helps. Installed FreeBSD 2.2.7. With 2.2.7 the disk maxed at about 12 MB/sec write and write. When I enabled tagged command queuing in 2.2.7, the write performance went down to 2 MB/sec. Using 3.0/3.1 disabling tagged command queuing didn't help. When only reducing the number of tags from 64 (which the drive supported/CAM reported) to 8/16 (min/max) I got a SCSI race condition, error messages of SCSI bus. Well, now I'm using 2.2.8-STABLE :-) Had loved to use 3.1, but no way ... This is now the 2nd problem ... Perhaps our scsi gurus have to look at it ?! I can't send my drive to Kenneth or Justin, sorry. Andreas /// On Thu, Feb 18, 1999 at 11:24:21PM +0100, Paul van der Zwan wrote: > > 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 -- Andreas Klemm http://www.FreeBSD.ORG/~andreas What gives you 90% more speed, for example, in kernel compilation ? http://www.FreeBSD.ORG/~fsmp/SMP/akgraph-a/graph1.html "NT = Not Today" (Maggie Biggs) ``powered by FreeBSD SMP'' To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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