Re: [OE-core] The swap partition's size is too big for BSP?
On Mon, 2011-07-04 at 13:35 +0800, Cui, Dexuan wrote: In meta/recipes-core/initrdscripts/files/init-install.sh, we have # 5% for the swap swap_ratio=5 # dexuan: this variable is not used at all! ... swap_size=$((disk_size*5/100)) This algorithm seems too wasty -- e.g., for a CrownBay box with a 160GB disk, we would create a 8GB swap partition while the box has only 1GB memory. What's the proper swap size? This link http://www.cyberciti.biz/tips/linux-swap-space.html discussed this and I think the below algorithm seems suitable for us: Systems with 2GB of ram or less require the same size of swap space Systems with 2GB to 4GB of ram require a minimum of 2GB of swap space Systems with 4GB to 16GB of ram require a minimum of 4GB of swap space Systems with 16GB to 64GB of ram require a minimum of 8GB of swap space Systems with 64GB to 256GB of ram require a minimum of 16GB of swap space Any comment? Looks like a much better idea to me, I'll take patches :) For reference if you want to do suspend to disk (swap) you need a lot of swap space btw. Still no where near that much though! Cheers, Richard ___ Openembedded-core mailing list Openembedded-core@lists.openembedded.org http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
Re: [OE-core] The swap partition's size is too big for BSP?
Richard Purdie wrote: On Mon, 2011-07-04 at 13:35 +0800, Cui, Dexuan wrote: In meta/recipes-core/initrdscripts/files/init-install.sh, we have # 5% for the swap swap_ratio=5 # dexuan: this variable is not used at all! ... swap_size=$((disk_size*5/100)) This algorithm seems too wasty -- e.g., for a CrownBay box with a 160GB disk, we would create a 8GB swap partition while the box has only 1GB memory. What's the proper swap size? This link http://www.cyberciti.biz/tips/linux-swap-space.html discussed this and I think the below algorithm seems suitable for us: Systems with 2GB of ram or less require the same size of swap space Systems with 2GB to 4GB of ram require a minimum of 2GB of swap space Systems with 4GB to 16GB of ram require a minimum of 4GB of swap space Systems with 16GB to 64GB of ram require a minimum of 8GB of swap space Systems with 64GB to 256GB of ram require a minimum of 16GB of swap space Any comment? Looks like a much better idea to me, I'll take patches :) Ok, I'll try to make a patch for this algorithm. For reference if you want to do suspend to disk (swap) you need a lot of swap space btw. Still no where near that much though! Does (or should )Yocto Linux support suspend-to-disk? I'm not sure about this. BTW: Linux can alse use a regular file as swap area. So in case the swap size is not enough (e.g., for suspend-to-disk), I think a user could create a big enough file to meet the need (I didn't test this with Linux yet). Thanks, -- Dexuan ___ Openembedded-core mailing list Openembedded-core@lists.openembedded.org http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
Re: [OE-core] The swap partition's size is too big for BSP?
On Mon, 2011-07-04 at 20:02 +0800, Cui, Dexuan wrote: Richard Purdie wrote: For reference if you want to do suspend to disk (swap) you need a lot of swap space btw. Still no where near that much though! Does (or should )Yocto Linux support suspend-to-disk? I'm not sure about this. BTW: Linux can alse use a regular file as swap area. So in case the swap size is not enough (e.g., for suspend-to-disk), I think a user could create a big enough file to meet the need (I didn't test this with Linux yet). I don't think we've supported it in the past, its just a datapoint to keep in mind. For reference, you can't use a file easily since the VM data needs to be available as the kernel boots to be able to resume from it. Cheers, Richard ___ Openembedded-core mailing list Openembedded-core@lists.openembedded.org http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
Re: [OE-core] The swap partition's size is too big for BSP?
Richard Purdie wrote: On Mon, 2011-07-04 at 20:02 +0800, Cui, Dexuan wrote: Richard Purdie wrote: For reference if you want to do suspend to disk (swap) you need a lot of swap space btw. Still no where near that much though! Does (or should )Yocto Linux support suspend-to-disk? I'm not sure about this. BTW: Linux can alse use a regular file as swap area. So in case the swap size is not enough (e.g., for suspend-to-disk), I think a user could create a big enough file to meet the need (I didn't test this with Linux yet). I don't think we've supported it in the past, its just a datapoint to keep in mind. Ok, so I can put a comment when I make the patch, saying this new algorithm doesn't work with suspend-to-disk in future. For reference, you can't use a file easily since the VM data needs to be available as the kernel boots to be able to resume from it. I admit I didn't try this on Linux. Windows does use a regular file when doing suspend-to-disk, so I thought Linux could do it, too... :-) Thanks, -- Dexuan ___ Openembedded-core mailing list Openembedded-core@lists.openembedded.org http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
[OE-core] The swap partition's size is too big for BSP?
In meta/recipes-core/initrdscripts/files/init-install.sh, we have # 5% for the swap swap_ratio=5 # dexuan: this variable is not used at all! ... swap_size=$((disk_size*5/100)) This algorithm seems too wasty -- e.g., for a CrownBay box with a 160GB disk, we would create a 8GB swap partition while the box has only 1GB memory. What's the proper swap size? This link http://www.cyberciti.biz/tips/linux-swap-space.html discussed this and I think the below algorithm seems suitable for us: Systems with 2GB of ram or less require the same size of swap space Systems with 2GB to 4GB of ram require a minimum of 2GB of swap space Systems with 4GB to 16GB of ram require a minimum of 4GB of swap space Systems with 16GB to 64GB of ram require a minimum of 8GB of swap space Systems with 64GB to 256GB of ram require a minimum of 16GB of swap space Any comment? Thanks, -- Dexuan ___ Openembedded-core mailing list Openembedded-core@lists.openembedded.org http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
