* "Benchmarks"
@ 2011-10-22 0:29 Brad Campbell
[not found] ` <4EA20E4E.8050402-+nnirC7rrGZibQn6LdNjmg@public.gmane.org>
0 siblings, 1 reply; 3+ messages in thread
From: Brad Campbell @ 2011-10-22 0:29 UTC (permalink / raw)
To: linux-bcache-u79uwXL29TY76Z2rM5mHXA
I use the term loosely.
This is with the raw drive being a Maxtor MaxlineII 250GB 7200RPM SATA
unit. It's about a 2004 vintage with over 30,000 hours on it. Slow and
steady.
The Cache device is an OCZ Vertex Plus 120GB Unit. Not all that fast or
clever. The Cache has writeback enabled and is formatted with -w512 so
that direct IO worked as previously discussed.
The benchmark is conducted inside an XP VM running under KVM. The device
is a qcow2 backing file formatted NTFS. I ran the test multiple times
without the cache until the numbers stabilised (the backing file was
being expanded as required)
http://www.fnarfbargle.com/private/111022_bcache/Without_Cache.png
http://www.fnarfbargle.com/private/111022_bcache/With_Cache.png
As expected a significant improvement in random small I/O. The VM is far
more responsive with the cache.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: "Benchmarks"
[not found] ` <4EA20E4E.8050402-+nnirC7rrGZibQn6LdNjmg@public.gmane.org>
@ 2011-10-24 17:10 ` Kent Overstreet
[not found] ` <CAC7rs0s3qCDYGnkbMv3NmxFR740mo48vV0mZa54TKbomFB7kjg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
0 siblings, 1 reply; 3+ messages in thread
From: Kent Overstreet @ 2011-10-24 17:10 UTC (permalink / raw)
To: Brad Campbell; +Cc: linux-bcache-u79uwXL29TY76Z2rM5mHXA
Cool!
The thing I'd be really curious about is what the benchmarks would
look like if you were using only the SSD, no bcache.
How happy are you with it?
On Fri, Oct 21, 2011 at 8:29 PM, Brad Campbell
<lists2009-+nnirC7rrGZibQn6LdNjmg@public.gmane.org> wrote:
> I use the term loosely.
>
> This is with the raw drive being a Maxtor MaxlineII 250GB 7200RPM SATA unit.
> It's about a 2004 vintage with over 30,000 hours on it. Slow and steady.
>
> The Cache device is an OCZ Vertex Plus 120GB Unit. Not all that fast or
> clever. The Cache has writeback enabled and is formatted with -w512 so that
> direct IO worked as previously discussed.
>
> The benchmark is conducted inside an XP VM running under KVM. The device is
> a qcow2 backing file formatted NTFS. I ran the test multiple times without
> the cache until the numbers stabilised (the backing file was being expanded
> as required)
>
> http://www.fnarfbargle.com/private/111022_bcache/Without_Cache.png
> http://www.fnarfbargle.com/private/111022_bcache/With_Cache.png
>
> As expected a significant improvement in random small I/O. The VM is far
> more responsive with the cache.
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-bcache" in
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>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: "Benchmarks"
[not found] ` <CAC7rs0s3qCDYGnkbMv3NmxFR740mo48vV0mZa54TKbomFB7kjg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
@ 2011-10-27 3:54 ` Brad Campbell
0 siblings, 0 replies; 3+ messages in thread
From: Brad Campbell @ 2011-10-27 3:54 UTC (permalink / raw)
To: Kent Overstreet; +Cc: linux-bcache-u79uwXL29TY76Z2rM5mHXA
On 25/10/11 01:10, Kent Overstreet wrote:
> Cool!
>
> The thing I'd be really curious about is what the benchmarks would
> look like if you were using only the SSD, no bcache.
I'll see what I can do when I next fire up the staging server.
> How happy are you with it?
Well, it does what it says on the tin for quick and dirty benchmarks,
but I really can't even contemplate it on a production machine until it
is compatible with md, and preferably has dirty write mirroring.
Now I have a permanent staging server, I'll keep playing with it as the
code evolves though.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2011-10-22 0:29 "Benchmarks" Brad Campbell
[not found] ` <4EA20E4E.8050402-+nnirC7rrGZibQn6LdNjmg@public.gmane.org>
2011-10-24 17:10 ` "Benchmarks" Kent Overstreet
[not found] ` <CAC7rs0s3qCDYGnkbMv3NmxFR740mo48vV0mZa54TKbomFB7kjg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-10-27 3:54 ` "Benchmarks" Brad Campbell
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