Re: [PATCH 0/9] Scalability requirements for sysv ipc - v3

[Nadia Derbey]

KOSAKI Motohiro wrote:
> Hi
>
> nice improvement.
> but...
>
>
> >   2.6.25-rc3-mm1   2.6.25-rc3-mm1+   2.6.25-mm1   Patched 2.6.25-mm1
> > 1         1168441           1064021       876000               947488
> > 2         1094264            921059      1549592              1730685
> > 3         2082520           1738165      1694370              2324880
> > 4         2079929           1695521       404553              2400408
> > 5         2898758            406566       391283              3246580
> > 6         2921417            261275       263249              3752148
> > 7         3308761            126056       191742              4243142
> > 8         3329456            100129       141722              4275780
> >
> > 1st column: stock 2.6.25-rc3-mm1
> > 2nd column: 2.6.25-rc3-mm1 + ipc patches (store ipcs into idrs)
> > 3nd column: stock 2.6.25-mm1
> > 4th column: 2.6.25-mm1 + this pacth series.
>
>
> this result is slightly odd.
>
> similar to 2.6.25-rc3-mm1 and patched-2.6.25-mm1
> similar to 2.6.25-mm1 and 2.6.25-rc3-mm1
>
> but
>
> not similar to 2.6.25-rc3-mm1 and patched-2.6.25-rc3-mm1
> not similar to 2.6.25-mm1 and patched-2.6.25-mm1
>
> Is patched-2.6.25-rc3-mm1 and patched-2.6.25-mm1 applied the same patch?

No

> or I misunderstand how to see your chart?

Well, looks like the description was not clear, sorry for that!
1st column: 2.6.25-rc3-mm1 with original ipc implementation
                           (i.e. ipcs stored in an array)
2nd column: 2.6.25-rc3-mm1, with ipcs stored in an idr tree
            actually, that's when the performance regression
            had been introduced.
3rd column: 2.6.25-mm1, still with the same implementation
            i.e. still with degraded performances.
4th column: 2.6.25-mm1 + rcu-based implementation of the idr,
            which is the current patch series.

Hope this makes things more clear.

Regards,
Nadia
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