Re: The end of TuxOnIce.

Am Mittwoch, 2. November 2011 schrieb Martin Steigerwald:
> I see about 18 seconds for about 784000 pages for hibernating as well
> as  resuming. Thats about 175 MiB/s each way. And in kernel-suspend
> seems to report the speed for compressing and saving the data as
> 784000*4/18/1000 is about 174 MiB/s. That might be okay for writing
> the image, but with compression I think even there it could be a bit
> faster still. But reading the images should still go quite much
> faster. I had seen reports with 400-500 MiB/s here on this list for
> TuxOnIce and that has been with older SSDs. And I know the Intel SSD
> 320 can serve 250 MB/s on sequential reads and about 155 MiB/s on
> sequential writes - direct I/O, io depth 64, measured by fio but with
> low blocksizes of 2-16 KiB/s. With a low compression factor of 30%
> this could theoretical give at least 300 MiB/s on reads and 186 MiB/s

Wrong, I multiplied with 1.2. Its 325 MiB/s for compressed reading and 
201,5 MiB/s for compressed writing.

> on writes. And with larger blocksizes a tad more speed at least for
> reading might be possible. Well still 400-500 MiB/s for reads seem out
> of reach as least unless LZO compresses with a better ratio. My
> estimate was low.

Make that almost 225 MiB/s for sequential writing and almost 280 
MiB/second for sequential reading with blocks of 4 MiB blocksize - I have 
these results laying around. Then that would be  364 MiB/s for 30% 
compressed reading and 292 MiB for 30% compressed writing. With 40% 
compression ratio it would be 392 MiB/s for reading and 315 MiB/s for 
writing.

Ciao,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
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