[Bugs] [Bug 1439731] Sharding: Fix a performance bug

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1439731

RamaKasturi <knarra at redhat.com> changed:

           What    |Removed                     |Added
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              Flags|needinfo?(kdhananj at redhat.c |
                   |om)                         |
                   |needinfo?(knarra at redhat.com |
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--- Comment #7 from RamaKasturi <knarra at redhat.com> ---
(In reply to Krutika Dhananjay from comment #6)
> (In reply to RamaKasturi from comment #5)
> > Hi Krutika,
> > 
> >    I tested this with the patch what you have provided and i see the
> > following results.
> > 
> > With out this fix following are the numbers i see:
> > ====================================================
> > Total lookups sent over the fuse mount are : 1057
> > 
> > Total lookups sent over the brick : 16273
> > 
> > There were ~1100 lookups from mount while the brick got > 16200 lookups.
> > 
> > With the fix following are the numbers i see:
> > ==============================================
> > 
> > Total lookups sent over the fuse mount : 1280
> > 
> > Total lookups sent over the brick : 3037
> 
> How did you calculate the number of lookups received by the bricks?

i checked the profile file for the data volume and under one of the brick i
looked at "Interval 0 stats" and at the lookup column fop. 

Here is the output from the profile of data volume:
=======================================================
http://pastebin.test.redhat.com/475027
> 
> -Krutika
> 
> > 
> > There were ~1300 lookups from the mount while the brick got > 3000 lookups.
> > Is this acceptable number?

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