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由 Laine Stump 提交于
See https://bugzilla.redhat.com/show_bug.cgi?id=599091 Saving a paused 512MB domain took 3m47s with the old block size of 512 bytes. Changing the block size to 1024*1024 decreased the time to 56 seconds. (Doubling again to 2048*1024 yielded 0 improvement; lowering to 512k increased the save time to 1m10s, about 20%)
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