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Re: [Qemu-block] [PATCH v7 6/9] qcow2: Increase the default upper limit

From: Leonid Bloch
Subject: Re: [Qemu-block] [PATCH v7 6/9] qcow2: Increase the default upper limit on the L2 cache size
Date: Mon, 13 Aug 2018 19:42:23 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0

I don't actually think it's so bad to keep the cache permanently
allocated, but I wouldn't object to a lower default for non-Linux hosts
either. 1 MB may still be a little too low, 4 MB (covers up to 32 GB)
might be more adequate. My typical desktop VMs are larger than 8 GB, but
smaller than 32 GB.


And for a Windows VM just the OS installation takes above 40 GB. While we probably are not running Windows VMs for our own needs, it is very common that a customer of, for example, some cloud service uses QEMU (unknowingly) for a full-blown Windows. So 100 GB+ images which are quite heavily used is not a rare scenario. 256 GB - yeah, that would be on the higher end.

So 16 MB would indeed be a reasonable default for the *max.* L2 cache now, although below that would be too little, I think. 32 MB - if we want some future-proofing.


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