[Serusers] vmstat: a lot of CS while writing memory back to database

Hi, can someone explain me, why we got a lot of context switches while write back the memory to database? modparam("usrloc", "db_mode", 2) modparam("usrloc", "timer_interval", 30) Looks like we have 2000 querys in that periode. procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 0 10716 15752 111820 793044 0 0 0 136 1292 2491 1 1 98 0 0 0 10716 15752 111820 793048 0 0 0 0 1079 1935 1 1 98 0 12 0 10716 15616 111824 793136 0 0 0 0 1896 298403 10 69 21 0 13 0 10716 15616 111824 793136 0 0 0 0 2259 400436 12 88 0 0 0 0 10716 15608 111824 793152 0 0 0 0 1691 101200 5 25 70 0 Would by write through a better solution for saving data in db? While SER is saving the Data, some register request are timing out. test by sipsak: All usrloc tests completed successful. received last message 12.012 ms after first request (test duration). All usrloc tests completed successful. received last message 12.069 ms after first request (test duration). All usrloc tests completed successful. received last message 9.171 ms after first request (test duration). All usrloc tests completed successful. received last message 8.777 ms after first request (test duration). timeout after 500 ms All usrloc tests completed successful. received last message 6.185 ms after first request (test duration). All usrloc tests completed successful. received last message 7.754 ms after first request (test duration). All usrloc tests completed successful. received last message 7.645 ms after first request (test duration). All usrloc tests completed successful. received last message 10.153 ms after first request (test duration). timeout after 500 ms timeout after 1000 ms version: ser 0.8.14-4 (i386/linux) flags: STATS:Off, USE_IPV6, USE_TCP, DISABLE_NAGLE, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, F_MALLOC, FAST_LOCK-ADAPTIVE_WAIT ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535 @(#) $Id: main.c,v 1.168.4.3.2.1 2004/10/22 17:21:32 andrei Exp $ main.c compiled on 12:47:12 Jul 12 2005 with gcc 3.3 Greets Markus