[Nfd-dev] [Mini-NDN] maximun erasable entries for CS (nfdc cs erase)

[Junxiao Shi]

Hi Aman

nfdc cs erase command currently maps to cs/erase
<https://redmine.named-data.net/projects/nfd/wiki/CsMgmt/17> command.

A forwarder MAY impose a non-zero upper bound on *Count*. If *Count* in a
request exceeds the upper bound (including when it is omitted, i.e. "no
limit"), the forwarder acts as if *Count* was set to the upper bound.

This is why you can only erase 256 entries each time.

https://redmine.named-data.net/issues/4744 is to add a loop within nfdc cs
erase command, so that you can erase as many entries as you want without
blocking the forwarder.
You are welcomed to contribute this feature.

Yours, Junxiao

On Mon, Sep 24, 2018 at 11:52 PM, Aman Maldar <amanmaldar at gmail.com> wrote:

> Hello All,
> I am running
> > nfdc cs erase <prefix_name> count <number>
>
> I see maximum number of entries that are deleted in single command are
> restricted to 256.
> I have apprx. 65000 entries in CS and I wanted to delete big chunk at
> once. I can do this by using a loop, but just want to check if this feature
> has been built with count = max 256.
>
> See the steps below
>
> lenovo at lenovo-VirtualBox:~$ nfdc cs info
> CS information:
>   capacity=65536
>      admit=on
>      serve=on
> *  nEntries=63708*
>      nHits=80000
>    nMisses=80134
> lenovo at lenovo-VirtualBox:~$ nfdc cs erase /ndn/d-site count 200
>     (works well for count = 200)
> cs-erased prefix=/ndn/d-site count=200 has-more=no
> lenovo at lenovo-VirtualBox:~$ nfdc cs erase /ndn/d-site count 400
>           (Note - Even if I put 400 as count, only 256 entries are deleted)
> cs-erased prefix=/ndn/d-site count=256 has-more=yes
> lenovo at lenovo-VirtualBox:~$ nfdc cs erase /ndn/d-site count 10000
>
> cs-erased prefix=/ndn/d-site count=256 has-more=yes
> lenovo at lenovo-VirtualBox:~$ nfdc cs info
> CS information:
>   capacity=65536
>      admit=on
>      serve=on
>   nEntries=62999
>      nHits=80000
>    nMisses=80146
>
> Thanks in Advance.
> - Aman
>
>
>
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