On Sat, Aug 11, 2012 at 12:23 AM, Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx> wrote: > Using a KVM guest with 32x vCPUs and 4G memory, the results for 4x > random I/O now look like: > > workload | jobs | 25% write / 75% read | 75% write / 25% read > -----------------|------|----------------------|--------------------- > 1x rd_mcp LUN | 8 | ~155K IOPs | ~145K IOPs > 16x rd_mcp LUNs | 16 | ~315K IOPs | ~305K IOPs > 32x rd_mcp LUNs | 16 | ~425K IOPs | ~410K IOPs > > The full fio randrw results for the six test cases are attached below. > Also, using a workload of fio numjobs > 16 currently makes performance > start to fall off pretty sharply regardless of the number of vCPUs.. > > So running a similar workload with loopback SCSI ports on bare-metal > produces ~1M random IOPs with 12x LUNs + numjobs=32. At numjobs=16 here > with vhost the 16x LUN configuration ends up being in the range of ~310K > IOPs for the current sweet spot.. This makes me wonder what a comparison against baremetal looks like and the perf top, mpstat, and kvm_stat results on the host. Stefan -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
