[rescue] Some SCSI2SD Numbers

[Raymond Wiker]

Try setting bs higher (1m, for example).

On Wed, Nov 1, 2017 at 8:41 AM, Eddie Cottongim <eddie_cottongim at cox.net>
wrote:

> Since we were discussing various SCSI replacements, I got some speed
> numbers for both the V5 and V5 SCSI2SD devices.
>
> Setup:
> SPARCStation 20 built in SCSI controller - CDROM cable.
> Patriot "Class 10" 32 GB SD Card
> Linux (probably a 2.6ish kernel)
> I tried a few file benchmarking tools, but didn't really like any of them
> and got tired of building them, so I stuck to sequential speeds with "dd".
>
> The third number is the V6 in "turbo" mode, supposed to drive the SD card
> faster and perhaps push the SCSI timings.
>
> Sequential reads
> dd if=gcc-4.6.4.tar.bz2  bs=512 of=/dev/null
> v5        72006076 bytes (72 MB) copied, 60.1136 seconds, 1.2 MB/s
> v6        72006076 bytes (72 MB) copied, 14.6039 seconds, 4.9 MB/s
> v6 6.1.1T    72006076 bytes (72 MB) copied, 14.231 seconds, 5.1 MB/s
>
> dd if=curl.tar.gz   bs=4096 of=/dev/null
> v5        59883520 bytes (60 MB) copied, 51.6644 seconds, 1.2 MB/s
> v6        59883520 bytes (60 MB) copied, 10.0634 seconds, 6.0 MB/s
> v6 6.1.1T    59883520 bytes (60 MB) copied, 9.96611 seconds, 6.0 MB/s
>
> Sequential writes
> dd if=/dev/zero bs=512 count=65536 of=testfile
> v5        33554432 bytes (34 MB) copied, 18.3618 seconds, 1.8 MB/s
> v6        33554432 bytes (34 MB) copied, 17.491 seconds, 1.9 MB/s
> v6 6.1.1T    33554432 bytes (34 MB) copied, 15.1965 seconds, 2.2 MB/s
>
> Notes:
> Its definitely worth using at least a Class 10 SD card. I also tried a
> Class 4 card, and it topped out at about 1.2 mb/sec read, 850 kb/sec write
> even on the V6.
> The Class 10 card is supposed to do at least 10 mb/sec write, and at least
> that much (maybe much more) read. These numbers didn't come as close as I
> expected.
> I saw some minor improvements with the latest V5 firmware (reflected
> above).
>
> I hope these are interesting.
> _______________________________________________
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue