Document the iothread poll-weight XML attribute in formatdomain. Extend the description of iothread polling controls to cover the new poll-weight attribute and how it relates to the existing poll-max, poll-grow, and poll-shrink settings. Also document the accepted range and the meaning of zero as a request for the hypervisor default. Signed-off-by: Jaehoon Kim <jhkim@linux.ibm.com> --- docs/formatdomain.rst | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst index 3ba981422f..b173fc897b 100644 --- a/docs/formatdomain.rst +++ b/docs/formatdomain.rst @@ -815,7 +815,7 @@ host/guest with many LUNs. :since:`Since 1.2.8 (QEMU only)` <iothread id="4"/> <iothread id="6"/> <iothread id="8" thread_pool_min="2" thread_pool_max="32"> - <poll max='123' grow='456' shrink='789'/> + <poll max='123' grow='456' shrink='789' weight='3'/> </iothread> </iothreadids> <defaultiothread thread_pool_min="8" thread_pool_max="16"/> @@ -849,6 +849,12 @@ host/guest with many LUNs. :since:`Since 1.2.8 (QEMU only)` polling. Attributes ``grow`` and ``shrink`` override (or disable when set to ``0``) the default steps for increasing/decreasing the polling interval if the set interval is deemed insufficient or excessive. + :since:`Since 12.6.0` the optional attribute ``weight`` sets the shift value + for the adaptive polling algorithm, controlling how much the most recent + event interval affects the next polling duration calculation. Larger values + decrease the weight of recent events, producing more gradual adjustments. + Valid range is ``[0, 63]``. Setting ``weight`` to ``0`` lets the hypervisor + select its default value. ``defaultiothread`` This element represents the default event loop within hypervisor, where I/O requests from devices not assigned to a specific IOThread are processed. -- 2.54.0