Re: [Wireshark-commits] rev 39149: /trunk/epan/dissectors/ /trunk/epan/dissectors/: packet-daap.c packet-dcp-etsi.c packet-dec-bpdu.c packet-dec-dnart.c packet-dhcp-failover.c packet-dis.c packet-distcc.c packet-dlm3.c ...

[Anders Broman <a.broman () bredband net>]

Guy Harris skrev 2011-09-27 22:04:
> On Sep 27, 2011, at 12:56 PM, Jeff Morriss wrote:
>
> > (It does appear that Wireshark does cache the column information; scrolling back or clicking on earlier packets does 
> > not result in the column info being rebuilt, even if the dissector is called again.)
> Note: that should not be treated as a specification.  It should be treated as an implementation detail subject to 
> change.
>
> Caching the column information takes less memory than generating all column information for all packets when the file is read in and saving 
> it all (as was done with the old packet list), but not caching the information would take even less memory. If the only columns cached are 
> ones displayed, it won't be much less memory, but if sorting on a column means that column's contents, for all packets, are 
> generated and saved, sorting on a column gets expensive.  (I haven't checked, but there's probably no reason that searching for 
> packets with given text in a column needs to cache the column information, so that should, at least in theory, not chew up additional 
> memory.)
We also try to save memory by storing the column strings in a string 
pool to avoid storing duplicates.
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