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SubjectRe: Indirect IO in Linux, some figures
On Sat, Apr 03 1999, Douglas Gilbert wrote:
> Buffer_size to_user_space to_kernel
> -------------------------------------
> 488KB 10.08 7.34
> 256KB 10.43 7.79
> 128KB 11.31 8.81
> 64KB 13.49 10.89
> 32KB 17.96 14.43
> 16KB 24.55 22.60
> 8KB 40.44 38.96
> 4KB 74.66 71.71
>
> The computer was an AMD K6-2 300MHz, super 7 motherboard (Via) with
> 64MB of PCI-100 RAM. An Advansys 940UW SCSI adapter was used with an
> IBM DCHS04U ultra wide disk.

Buffer_size to_user_space to_kernel
-------------------------------------
671KB 8.02 5.55
512KB 7.69 5.59
488KB 7.70 5.61
256KB 8.01 5.96
128KB 8.61 6.62
64KB 9.62 7.63
32KB 11.99 10.30
16KB 17.19 15.61
8KB 27.86 26.34
4KB 43.02 42.54
This is a PII 400MHz, Adaptec 7890, IBM DRSV09V, 2.2.5-ac3

--
* Jens Axboe <axboe@image.dk>
* Linux CD-ROM Maintainer

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