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Hi all, Is there some documentation or some example on how to interpret the arg0 .. arg<n> for the aioread, aiowrite, aiowait syscalls? The system call name for all three seems to be "kaio". Michael === Michael Mueller ================== Tel. + 49 8171 63600 Fax. + 49 8171 63615 Web: http://www.michael-mueller-it.de ======================================

...berto/2015/12/17/improving-disk-io-performance-in-qemu-2-5-with-the-qcow2-l2-cache/ shows huge performance hit for a 20GB qcow2 with default 64kB cluster size: L2 Cache, MiB Average IOPS 1 (default) 5100 1.5 7300 2 12700 2.5 63600 The above link also gives the formula: optimal L2 cache size = L2 table size = (8 Byte) * (disk size) / (cluster size) and the QEMU command line for setting L2 cache size, which is not persistent, but must be specified at each invocation: qemu-system-x86_64 -drive file=hd.qcow2,l2-cache-size=2621...

...isk-io-performance-in-qemu-2-5-with-the-qcow2-l2-cache/ >shows huge performance hit for a 20GB qcow2 with default 64kB cluster size: > >L2 Cache, MiB Average IOPS >1 (default) 5100 >1.5 7300 >2 12700 >2.5 63600 > >The above link also gives the formula: >optimal L2 cache size = L2 table size = (8 Byte) * (disk size) / (cluster size) > >and the QEMU command line for setting L2 cache size, which is not persistent, but must be specified at each invocation: >qemu-system-x86_64 -drive file=hd....

...usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success' [ 1008.985212] perf: interrupt took too long (2507 > 2500), lowering kernel.perf_event_max_sample_rate to 79500 [ 3573.969403] perf: interrupt took too long (3144 > 3133), lowering kernel.perf_event_max_sample_rate to 63600 [ 3723.963109] nouveau 0000:01:00.0: disp: ERROR 4 [INVALID_ARG] 84 [] chid 0 mthd 089c data f0000001 [ 3723.963134] nouveau 0000:01:00.0: disp: ERROR 5 [INVALID_STATE] 0f [] chid 0 mthd 0080 data 00000000 [ 3723.963138] nouveau 0000:01:00.0: disp: Core: [ 3723.963143] nouveau 0000:01:00.0: disp:...