Hi Jens, I've noticed a performance gap between the cfq scheduler and other io schedulers when running the rawio benchmark. Results from rawio on 2.6.19, cfq and noop schedulers:
CFQ: procs device num read KB/sec I/O Ops/sec ----- --------------- ---------- ------- -------------- 16 /dev/sda 16412 8338 2084 ----- --------------- ---------- ------- -------------- 16 16412 8338 2084 Total run time 0.492072 seconds NOOP: procs device num read KB/sec I/O Ops/sec ----- --------------- ---------- ------- -------------- 16 /dev/sda 16399 29224 7306 ----- --------------- ---------- ------- -------------- 16 16399 29224 7306 Total run time 0.140284 seconds The benchmark workload is 16 processes running 4k random reads. Is this performance gap a known issue? Thanks, Avantika Mathur - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
