Date: Wed, 18 Oct 2023 09:21:29 +0200 From: infoomatic <infoomatic@gmx.at> To: freebsd-fs@freebsd.org Subject: Re: performance impact of various compression schemes on a zvol Message-ID: <c9f1b0a3-2cf8-4209-89a8-77e9b501e394@gmx.at> In-Reply-To: <ZS8Lt5wGKc6vIRrf@int21h> References: <ZS8Lt5wGKc6vIRrf@int21h>
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On 18.10.23 00:33, void wrote: > What's the perfomance penalty on zvols of compression? > The impact on the host? This totally depends on your data. I did some tests on our mailserver, and for us it boiled down to: *) use lz4 if performance is very important, and compression rate not so much. We found that the impact of lz4 is so fast that our workloads were quite faster than any test without compression, so I would say you can set lz4 in any way (lz4 is very fast on detecting incrompressible data) *) use between zstd-6 and zstd-9 (not too much difference in our tests) if you want a nice balance where performance is not too much affected and we reach a nice level of compression, however, of course your definition of "maximum performance penalty" may be different. You could check out lzbench. Regards, Robert
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