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Re: Big TCG slowdown when using zstd with aarch64


From: Thomas Huth
Subject: Re: Big TCG slowdown when using zstd with aarch64
Date: Fri, 2 Jun 2023 11:24:00 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0

On 02/06/2023 11.10, Daniel P. Berrangé wrote:
...
IMHO this feels like just another example of compression being largely
useless. The CPU overhead of compression can't keep up with the guest
dirty workload, making the supposedly network bandwidth saving irrelevant.

Has anybody ever shown that there is a benefit in some use cases with compression? ... if not, we should maybe deprecate this feature and remove it in a couple of releases if nobody complains. That would mean less code to maintain, less testing effort, and likely no disadvantages for the users.

 Thomas




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