"Dr. David Alan Gilbert" <[email protected]> wrote:
> * Juan Quintela ([email protected]) wrote:
>> Signed-off-by: Juan Quintela <[email protected]>
> +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.
