From: rwhron@earthlink.net
To: piggin@cyberone.com.au, akpm@digeo.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: i/o benchmarks on 2.5.70* kernels
Date: Tue, 17 Jun 2003 07:14:00 -0400 [thread overview]
Message-ID: <20030617111400.GA11839@rushmore> (raw)
> tiobench on SMP results are not very good, lots of
> fragmentation, the random IO throughput drops is
> probably due to AS strangling TCQ though. You are
> using SMP and TCQ, right?
SMP yes. The non-benchmarked disks (which don't matter
say this at boot time:
scsi0:A:1:0: Tagged Queuing enabled. Depth 4
(aic7xxx)
These config options on the non-benchmarked disks:
CONFIG_AIC7XXX_CMDS_PER_DEVICE=4
CONFIG_AIC7XXX_RESET_DELAY_MS=15000
CONFIG_AIC7XXX_DEBUG_ENABLE=y
CONFIG_AIC7XXX_DEBUG_MASK=0
CONFIG_AIC7XXX_REG_PRETTY_PRINT=y
----
The benchmarked disks are on scsi3 and scsi4.
The benchmarked disks do not tell what TCQ they have.
CONFIG_SCSI_QLOGIC_ISP=y
CONFIG_SCSI_QLOGIC_FC=y
CONFIG_SCSI_QLOGIC_FC_FIRMWARE=y
TCQ on the benchmarked disks may be 1024...
+#define MAXISPREQUEST(isp) ((IS_FC(isp) || IS_ULTRA2(isp))? 1024 : 256)
but that's just a guess.
--
Randy Hron
http://home.earthlink.net/~rwhron/kernel/bigbox.html
next reply other threads:[~2003-06-17 10:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-17 11:14 rwhron [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-06-18 22:50 i/o benchmarks on 2.5.70* kernels rwhron
2003-06-18 23:22 ` Andrew Morton
2003-06-19 8:28 ` Nick Piggin
2003-06-17 5:32 rwhron
2003-06-17 6:27 ` Nick Piggin
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