Re: Indirect IO in Linux, some figures

Matthew Jacob (mjacob@feral.com)
Sat, 3 Apr 1999 09:12:17 -0800 (PST)

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>
> Perhaps someone out there would like to do the same test on faster
> hardware, especially a U2W SCSI adapter that has a theoretical
> maximum throughput of 80MB/sec.

2xPPro 200Mhz with 256MB memory. sg driver from your website (nice bit of
work). Linux 2.2.5.

Seagate ST19171FC Fibre Channel Disk, Qlogic QLA2100 FC HBA, my driver
(which I'll be the first to admit is relatively unoptimized):

Buffer_size to_user_space to_kernel
-----------------------------------------
512KB 9.49 (21MB/s) 2.95 (68MB/s)
488KB 9.56 3.01
256KB 9.88 3.34
128KB 10.54 4.23
64KB 12.17 6.11
32KB 15.80 9.82
16KB 23.34 17.52
8KB 38.32 32.58
4KB 68.76 63.26

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