[zfs-discuss] Re: LZ4 compression not living up to hype

Ryan How ryan at zbit.net.au
Sat Aug 3 04:16:13 EDT 2013


Is the actual file copy speed any slower?

At 80MB/sec you'll be coming close to saturating a gigabit network.
So I'd expect the disk write speed to be lower because it is compressed 
and there is less being written to disk.

You are getting pretty good write speeds. I'd be happy with it :)


On 3/08/2013 3:15 PM, chris at cptechconsulting.com wrote:
> Ok oddly I did another test with compression off and watched the load 
> and it got up to 4.35.  Yet its faster?
>
> I have no idea now...
>
> On Thursday, August 1, 2013 5:42:55 AM UTC-4, 
> ch... at cptechconsulting.com wrote:
>
>     Hello,
>
>     So im building a new home nas.  Ubuntu 12.04 w/ZFS.  Setup a new
>     pool.  Copying files to pool over smb.
>
>     LZ4 compression off averages 80MB/sec
>
>     LZ4 compression on averages 50MB/sec
>
>     I read all this praise about how great LZ4 was but I didn't expect
>     this big of performance hit.  Anyone else not seeing LZ4 perform
>     well?  Also, im running this on desktop level commodity hardware,
>     maybe that has something to do with it?
>
>     Feedback appreciated!
>
>
>     Thanks,
>     Chris
>
>

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