Some Unix benchmarks for those who are interesed

[Ivan Voras]

Fluffles wrote:

> gstripe (4 disks on nVidia controller [Embedded], 128KB stripesize, Test
> System 1)
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>  DD benchmark(1GB)      Results in MB/s                 avg
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> 4k      READ            47.1    46.9    46.8            46.9
>         WRITE           40.9    40.9    41.0            40.9
> 16k     READ            92.7    92.8    92.6            92.7
>         WRITE           76.3    76.1    76.2            76.2
> 64k     READ            120.8   120.6   120.6           120.6
>         WRITE           96.1    96.2    96.1            96.1
> 128k    READ            123.0   122.8   122.8           122.8
>         WRITE           96.3    96.4    96.2            96.3
> 1m      READ            122.7   122.9   122.6           122.7
>         WRITE           89.4    89.4    89.4            89.4

So, writing to a striped set is 37% faster than reading...

> geom_raid5 with 8 SATA disks (128KB stripe, graid5-tng, Test System 2)
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>  DD benchmark(1GB)      Results in MB/s                 avg
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> 4k      READ            58.1    58.7    59.0            58.6
>         WRITE           155.5   155.8   154.3           155.2
> 16k     READ            130.0   125.6   129.5           128.3
>         WRITE           308.5   306.3   306.9           307.2
> 64k     READ            183.8   183.9   188.9           185.5
>         WRITE           416.9   416.7   415.8           416.4
> 128k    READ            197.3   194.4   197.6           196.4
>         WRITE           421.0   426.2   399.7           415.6
> 1m      READ            193.0   196.8   198.1           195.9
>         WRITE           327.6   330.3   331.0           329.6
> 

Similar here: 69% faster, even though writing to RAID5 involves block
ECC (XOR probably) calculations and writing to at least two disks, and
reading doesn't.

Interesting. Any ideas why? (anybody?)



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