too many sites, change server_names_hash_max_size?

[Max]

Hello,

My nginx is hosting more than 200 sites. But when I reload it, it said I
need to increase the following size:

server_names_hash_max_size
server_names_hash_bucket_size

So I just increased it to:

   server_names_hash_max_size 1024;
   server_names_hash_bucket_size 128;

After that, nginx can reload, but my server is always out of memory(4gb in
my server). So any body know if I change the above variables, will it affect
the performance of the server?

Thanks.

Max
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