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Re: [PATCH v3 00/23] Migration: Transmit and detect zero pages in the mu

From: Peter Xu
Subject: Re: [PATCH v3 00/23] Migration: Transmit and detect zero pages in the multifd threads
Date: Wed, 24 Nov 2021 18:24:22 +0800

On Wed, Nov 24, 2021 at 11:05:54AM +0100, Juan Quintela wrote:
> Hi
> Trying with a different server.
> As it used to happen, when I sent everything only to me, everything worked.
> Sorry folks.
> [v2]
> This is a rebase against last master.
> And the reason for resend is to configure properly git-publish and
> hope this time that git-publish send all the patches.

I do suffer from this too.  I normally use git-publish parameters "-S" plus
"-R" together when it happens, then in the interactive console selectively send
leftover series to complete previous attempt.

I think it's not a bug for git-publish, but git-send-email with fail with an
SMTP error.  I'm no expert of that, but iirc last time we discussed Paolo
mentioned it could be a git-send-email bug.  Copy Paolo for that in case
there's any further clue out of it.

> Please, review.
> [v1]
> Since Friday version:
> - More cleanups on the code
> - Remove repeated calls to qemu_target_page_size()
> - Establish normal pages and zero pages
> - detect zero pages on the multifd threads
> - send zero pages through the multifd channels.
> - reviews by Richard addressed.
> It pases migration-test, so it should be perfect O:+)

OK I "agree". :-D

Besides, shall we try measure some real workloads?  E.g. total migration time
of an idle guest doing 8 channels multifd migration with/without the patchset?
I'd expect there's a huge speedup on that even with a low speed NIC, and it'll
be great to verify it.

Peter Xu

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