Greetings, One of my servers have root on FC via isp(4). Recently it was updated to 9-STABLE and the server seem to work slower than it did on 8-STABLE. This seems not to be about read/write speed (dd test show big numbers). In certain cases it is "stuck" with IO writes. Eventually it had big load and I saw the situation - iostat show small MB/s, but about 20 w/s and at the same time most of processes in top(1) are in kqueue state, sometimes top three change to tstile and return back to kqueue. During that load it is hard to use command-line - it is sticking on any IO operation, but top do not show significant user or interrupt load. However, it is not overwhelmed, it feel good after load get reduced.
I assume lot of processes in same state and incapability of doing 20-50 writes a second means I have a problem here. What the direction to work this problem out? -- Sincerely yours, Dima Veselov Physics R&D Establishment of Saint-Petersburg University
