"Dr. David Alan Gilbert" <dgilb...@redhat.com> wrote: > * Juan Quintela (quint...@redhat.com) wrote: >> Signed-off-by: Juan Quintela <quint...@redhat.com>
> +static void test_xbzrle(const char *uri) >> +{ >> + QTestState *from, *to; >> + >> + test_migrate_start(&from, &to, uri); >> + >> + /* We want to pick a speed slow enough that the test completes >> + * quickly, but that it doesn't complete precopy even on a slow >> + * machine, so also set the downtime. >> + */ >> + /* 100 ms */ >> + migrate_set_parameter(from, "downtime-limit", "100"); >> + /* 1MB/s slow*/ >> + migrate_set_parameter(from, "max-bandwidth", "100000000"); >> + >> + migrate_set_cache_size(from, "50000000"); > > Why 50MB? I guess this is an interesting test; the program > dirties 100MB of RAM repeatedly, one byte/page. So 50MB is probably > not much use becuase it'll thrash. No good reason. What I want (tm): - if you have fast hardware, test is as fast as it can - if you don't have fast hardware (or very overloaded), it don't fail My current idea is: - using 1GB/s for speed - using downtime = 1ms when I want to wait for migration not converge - using downtime = 300ms when I want it to finish I am open to other numbers. >> + migrate_set_capability(from, "xbzrle", "true"); >> + migrate_set_capability(to, "xbzrle", "true"); >> + /* Wait for the first serial output from the source */ >> + wait_for_serial("src_serial"); >> + >> + migrate(from, uri); >> + >> + wait_for_migration_pass(from); >> + >> + /* 1GB/s now it should converge */ >> + migrate_set_parameter(from, "max-bandwidth", "1000000000"); > > I wonder about doing a set_cache_size 150MB here, with a delay before > the max-bandwidht? If we're lucky at 150MB it'll start actually using > the XBZRLE compression. > >> + if (!got_stop) { >> + qtest_qmp_eventwait(from, "STOP"); >> + } >> + qtest_qmp_eventwait(to, "RESUME"); >> + >> + wait_for_serial("dest_serial"); >> + wait_for_migration_complete(from); >> + >> + test_migrate_end(from, to); > > Extract xbzrle stats? Thinking about that. I actually would want to test that when I set something, read it back that it is what I setted. I gues I would use a similar trick to what you do to get the pass number. Later, Juan.