[7146] in linux-scsi channel archive
Re: Fixing the SCSI layer
daemon@ATHENA.MIT.EDU (Marc SCHAEFER)
Sun Sep 5 04:02:27 1999
To: linux-scsi@vger.rutgers.edu
From: Marc SCHAEFER <schaefer@alphanet.ch>
Date: 5 Sep 1999 10:00:13 +0200
Mark Veteikis <mark@iphase.com> wrote:
> Besides, cleaning up the code, has anyone identified specific performance
> problems that need to be fixed in the SCSI mid-layer? For some reason the
> Interphase FC adapter is topping out at ~72MB/s on sequential reads,
> this seems rather low, knowing that we can get 90+ with identical hardware
> under NT.
DId you try with the benchio raw benchmark (available on sunsite). benchio
just sends commands from a fixed-size 64k buffer, read and write, directly
to the first low-level SCSI host adapter (through queuecommand()) and
the first disk.
This can be used to evaluate top raw performance. Nothing else.
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