From: Thomas Huth <thuth@redhat.com>
To: quintela@redhat.com
Cc: "Daniel P. Berrangé" <berrange@redhat.com>,
qemu-devel@nongnu.org, peter.maydell@linaro.org,
"Richard Henderson" <rth@twiddle.net>,
"Peter Xu" <peterx@redhat.com>
Subject: Re: Big TCG slowdown when using zstd with aarch64
Date: Fri, 2 Jun 2023 11:47:50 +0200 [thread overview]
Message-ID: <ea218aad-6ba8-0f82-2570-a16354abff58@redhat.com> (raw)
In-Reply-To: <87leh2p5qb.fsf@secure.mitica>
On 02/06/2023 11.34, Juan Quintela wrote:
...
> The compression on precopy is a complete different beast:
> - It is *VERY* buggy (no races fixed there)
> - It is *VERY* inneficient
> copy page to thread
> thread compress page in a different buffer
> go back to main thread
> copy page to migration stream
>
> And we have to reset the compression dictionaries over each page, so
> we don't get the benefits of compression.
>
> So I can't wait the day that we can remove it.
So could you maybe write a patch to add it to the docs/about/deprecated.rst
file?
Thomas
next prev parent reply other threads:[~2023-06-02 9:48 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-01 21:06 Big TCG slowdown when using zstd with aarch64 Juan Quintela
2023-06-02 9:10 ` Daniel P. Berrangé
2023-06-02 9:22 ` Peter Maydell
2023-06-02 9:37 ` Daniel P. Berrangé
2023-06-02 9:42 ` Alex Bennée
2023-06-02 9:24 ` Thomas Huth
2023-06-02 9:34 ` Juan Quintela
2023-06-02 9:47 ` Thomas Huth [this message]
2023-06-02 9:25 ` Juan Quintela
2023-06-02 10:14 ` Daniel P. Berrangé
2023-06-02 10:41 ` Juan Quintela
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