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Re: [Qemu-stable] [PATCH] migration: disable auto-converge during bulk b
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-stable] [PATCH] migration: disable auto-converge during bulk block migration |
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Date: |
Fri, 22 Sep 2017 11:22:51 +0100 |
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User-agent: |
Mutt/1.8.3 (2017-05-23) |
On Thu, Sep 21, 2017 at 02:32:32PM +0200, Peter Lieven wrote:
> auto-converge and block migration currently do not play well together.
> During block migration the auto-converge logic detects that ram
> migration makes no progress and thus throttles down the vm until
> it nearly stalls completely. Avoid this by disabling the throttling
> logic during the bulk phase of the block migration.
Please include the rationale in a comment here:
> - if (migrate_auto_converge()) {
> + if (migrate_auto_converge() && !blk_mig_bulk_active()) {
That way it's clear why auto-converge isn't enabled when block migration
is active.