hi, All, We are testing HP DL380 G7 with Redhat Linux 5.4, load it with lots of very small SQL (through a jdbc client with 50~100~200 session) continuesly issue SQL to database server; It is 2 socket/12 core system with 72gb memory; there are still tons of free emmory there; It is little bit interesting; We haven't used Linux on database server here, my last linux running oracle was 8 years ago with very early deployment of oracle rac on linux:). Does anyelse have similar experience? Any tuning needed from linux? We tested both dedicated server and shared server and see similar result; But if we continue to add more clients onto the server, the througput put will continue increase; I checked oracle hidden parameter and NUMA was not enabled; (_db_block_numa=1); There was nearly no disk IO(all in memory test, close to our real application running on that db); *pro*cs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ * r * b swpd free buff cache si so bi bo in cs us sy*id *wa st *24 * 0 0 28717536 584652 42109568 0 0 0 0 105512 184374 38 20 *42 * 0 0 *32 * 0 0 28718652 584652 42109568 0 0 0 64 104028 181991 37 20 *44 * 0 0 *30 * 0 0 28717784 584652 42109568 0 0 16 76 105590 184456 38 20 *42 * 0 0 *20 * 0 0 28718528 584652 42109572 0 0 0 64 97483 170011 35 18 4*7 *0 0 *29 * 0 0 28717908 584652 42109572 0 0 0 0 104939 182623 37 20 *43 * 0 0 *21 * 0 0 28718776 584652 42109576 0 0 16 61 105254 183564 37 20 *43 * 0 0 *16 * 0 0 28718032 584652 42109576 0 0 0 0 105541 184965 36 19 *44 * 0 0 *19 * 0 0 28718280 584652 42109576 0 0 0 0 93986 163849 32 17 5*1 *0 0 *23 * 0 0 28716420 584652 42109576 0 0 48 108 105028 182659 39 20 *42 * 0 0 *36 * 0 0 28717164 584652 42109576 0 0 0 0 105100 182699 36 20 *44 * 0 0 *34 * 0 0 28715552 584652 42109576 0 0 0 4 105538 183129 36 19 *45 * 0 0 *27 * 0 0 28716552 584652 42109608 0 0 16 60 95618 166890 33 18 5*0 *0 0 *31 * 0 0 28715056 584652 42109608 0 0 0 0 105478 183278 38 20 *43 * 0 0 *30 * 0 0 28715552 584652 42109608 0 0 0 104 105884 185131 38 20 *42 * 0 0 *22 * 0 0 28714808 584652 42109608 0 0 16 60 105680 185074 36 20 *44 * 0 0 -- Regards Zhu Chao