Re: Fusion-MPT much faster as module
From: Andrew Morton
Date: Mon Mar 21 2005 - 18:33:54 EST
Holger Kiehl <Holger.Kiehl@xxxxxx> wrote:
>
> Hello
>
> On a four CPU Opteron compiling the Fusion-MPT as module gives much better
> performance when compiling it in, here some bonnie++ results:
>
> Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
> -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
> Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
> compiled in 15872M 38366 71 65602 22 18348 4 53276 84 57947 7 905.4 2
> module 15872M 51246 96 204914 70 57236 14 59779 96 264171 33 923.0 2
>
> This happens with 2.6.10, 2.6.11 and 2.6.11-bk2. Controller is a
> Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI.
>
> Why is there such a large difference?
>
Holger, this problem remains unresolved, does it not? Have you done any
more experimentation?
I must say that something funny seems to be happening here. I have two
MPT-based Dell machines, neither of which is using a modular driver:
akpm:/usr/src/25> 0 hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 64 MB in 5.00 seconds = 12.80 MB/sec
That's a bit disappointing. Running 2.6.9-rc2-mm2(!) with a
SCSI storage controller: LSI Logic / Symbios Logic 53c1030 (rev 07)
controller on disks which shudl hit 50MB/sec.
And
bix:/home/akpm# hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 114 MB in 3.03 seconds = 37.57 MB/sec
with 2.6.11-rc4-mm1 using
Fusion MPT SCSI Host driver 3.01.16
scsi0 : ioc0: LSI53C1030, FwRev=01030600h, Ports=1, MaxQ=222, IRQ=25
scsi1 : ioc1: LSI53C1030, FwRev=01030600h, Ports=1, MaxQ=222, IRQ=26
Vendor: SEAGATE Model: ST3146807LW Rev: DS09
Type: Direct-Access ANSI SCSI revision: 03
Better, but again I'd expect >50MB/sec.
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