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Am 19.09.2013 06:47, schrieb Grant: |
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>>>> turn off readahead. ZFS' own readahead and the kernel's clash - badly. |
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>>>> Turn off kernel's readahead for a visible performance boon. |
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>>> You are probably not talking about ZFS readahead but about the ARC. |
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>> which does prefetching. So yes. |
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> I'm taking notes on this so I want to clarify, when using ZFS, |
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> readahead in the kernel should be disabled by using blockdev to set it |
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> to 8? |
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> |
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> - Grant |
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> |
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> . |
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> |
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you can't turn it off (afaik) but 8 is a good value - because it is just |
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a 4k block. |
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