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Am 13.10.2011 03:52, schrieb Pandu Poluan: |
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> Just stumbled upon this blog: |
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> |
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> http://www.webupd8.org/2011/10/increased-performance-in-linux-with.html |
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> |
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> anyone got any experience with zram/compcache on Gentoo? |
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> |
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> Rgds, |
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> |
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Hmm, it seems like my reply was eaten by the mail server. Apologies if |
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you receive this twice: |
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I use it on my laptop (4GB RAM, typically 1-2GB swap used). It |
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works pretty well but I can't give you any hard figures. |
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I wrote my own init script for this. I can share it if you want. |
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Otherwise the sunrise, betagarden and mv overlays offer ebuilds for it. |
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I think the mv version is closest to mine. |
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What has been pretty confusing is that there are two versions: The |
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original one from Google(?) and the one in the mainline kernel. They |
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have different APIs (hint: if you have a userland tool instead of |
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manipulating /sys, it is the original version) and only the original |
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version can use a swap device as an additional backend for |
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uncompressable pages. With the mainline version (which I use), you can |
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only use zram as an additional swap device and give it a higher priority |
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than your normal swap. |
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/etc/fstab: |
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/dev/zram0 none swap sw,pri=1,discard 0 0 |
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/dev/sda7 none swap sw,pri=0 0 0 |
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Only drawback so far: When zram is full, putting the laptop into standby |
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takes longer, maybe 15s compared to 3s without. Sometimes this can lead |
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to timeouts and the kernel aborts the suspend operation with an error on |
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dmesg. Reattempting it then succeeds. |
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Regards, |
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Florian Philipp |
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