Disable hyper-threading for better Solr performance?

[Avner Levy]

I have a machine with 16 real cores (32 with HT enabled).
I'm running on it a Solr server and trying to reach maximum performance for 
indexing and queries (indexing 20k documents/sec by a number of threads).
I've read on multiple places that in some scenarios / products disabling the 
hyper-threading may result in better performance results.
I'm looking for inputs / insights about HT on Solr setups.
Thanks in advance,
  Avner