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From: | Leonid Bloch |
Subject: | Re: [Qemu-devel] [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. Kevin
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.
Leonid.
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