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qemu: Slightly increase memory limit

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For low-memory domains (roughly under 400MB) our automatic memory limit
computation comes up with a limit that's too low. This is because the
0.5 multiplication does not add enough for such small values. Let's
increase the constant part of the computation to fix this.
This commit is contained in:
Jiri Denemark 2013-07-08 15:12:27 +02:00
parent a04e60b21f
commit f24e90d542
1 changed files with 2 additions and 2 deletions
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4
src/qemu/qemu_domain.c
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@ -2178,7 +2178,7 @@ qemuDomainMemoryLimit(virDomainDefPtr def)
* limit' has been chosen:
* (1 + k) * (domain memory + total video memory) + (32MB for
* cache per each disk) + F
* where k = 0.5 and F = 200MB. The cache for disks is important as
* where k = 0.5 and F = 400MB. The cache for disks is important as
* kernel cache on the host side counts into the RSS limit.
* Moreover, VFIO requires some amount for IO space. Alex Williamson
* suggested adding 1GiB for IO space just to be safe (some finer
@ -2193,7 +2193,7 @@ qemuDomainMemoryLimit(virDomainDefPtr def)
mem += def->videos[i]->vram;
mem *= 1.5;
mem += def->ndisks * 32768;
mem += 204800;
mem += 409600;
for (i = 0; i < def->nhostdevs; i++) {
virDomainHostdevDefPtr hostdev = def->hostdevs[i];