On Wed, Nov 25, 2020 at 7:04 PM Daniel P. Berrangé <berrange@xxxxxxxxxx> wrote: > > In testing the "vol-download" command in virsh, downloading a > 1G file takes a ridiculous amount of time (minutes) with the > new SSH helper. > > After the first patch is applied the time gets down to a much > more reasonable 5.5 seconds on my test machine. > > By comparison netcat achieved 4 seconds. > > After applying the second patch, the time is reduced to 3.5 > seconds, so we actually end up beating netcat, as long as > we have glib >= 2.64.0 available. > > Daniel P. Berrangé (2): > remote: make ssh-helper massively faster > util: avoid glib event loop workaround where possible I tested both patches and they didn't bring any new regressions as far as my tests went. The former issues of slow migration and vol-download are fixed and speed is now roughly on-par with the old netcat mode. Tested: - vol-download local - vol-download remote - migration with explicit native transfer ?proxy=native - migration with auto-mode selection - virsh console I also tested migrations with between patched and older versions: - patched <-> 6.6 - fall back to netcat (expected and ok). - patched -> 6.9 - slow (as before) - 6.9 -> patched - fast (which is good as upgrade paths use migration and it is sufficient to upgrade the target) Tested-by: Christian Ehrhardt <christian.ehrhardt@xxxxxxxxxxxxx> Thank you Daniel! > src/remote/remote_ssh_helper.c | 113 ++++++++++++++++++++------------- > src/util/vireventglib.c | 29 ++++++--- > 2 files changed, 89 insertions(+), 53 deletions(-) > > -- > 2.25.4 > > -- Christian Ehrhardt Staff Engineer, Ubuntu Server Canonical Ltd
