[NiteWave]

we got a lot of 500 and 400 request

what does it mean ?

can you show your whole benchmark command line?
like "ab -k -n ... "

should no need nginx, or the benchmark result should be very close regarding serve static content.

at present, varnish have more cache options/functions than lsws page cache. but if the cache rule is not that complex, should no need varnish as well. for example vBulletin -- http://www.litespeedtech.com/support...ache:vbulletin