Re: [PATCH] swap=device kernel commandline
Werner Almesberger [EMAIL PROTECTED] writes: Eric W. Biederman wrote: I have one that loads a second kernel over the network using dhcp to configure it's interface and tftp to fetch the image and boots that is only 20kb uncompressed Neat ;-) My goal is actually not only size, but also to have a relatively normal build environment, e.g. my example is with shared newlib, regular ash, and - unfortunately rather wasteful - glibc's ld.so. But a tftp loader in 20kB is rather good. Now the next challenge is the same thing with NFS. Then we can finally kill nfsroot ;-) Hmm. What does it take to mount an NFS partition? Anyway. All I did was wrote a tiny libc that is just a bunch of wrappers for syscalls, and some string functions. Then I just wrote a straight forward C program to do the job. Except for my added kexec call I can compile with glibc :) Now if glibc wouldn't link in 200k of unused crap when you make a trivial static binary I'd much prefer to use it... Though I wish it was possible to have a ramfs preloader instead of initrd. An initramfs would allow me to not even compile in the block device driver layer, and be more efficient. Eric - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
RE: [PATCH] swap=device kernel commandline
= Original Message From [EMAIL PROTECTED] (Eric W. Biederman) = Werner Almesberger [EMAIL PROTECTED] writes: Eric W. Biederman wrote: I have one that loads a second kernel over the network using dhcp to configure it's interface and tftp to fetch the image and boots that is only 20kb uncompressed Neat ;-) My goal is actually not only size, but also to have a relatively normal build environment, e.g. my example is with shared newlib, regular ash, and - unfortunately rather wasteful - glibc's ld.so. But a tftp loader in 20kB is rather good. Now the next challenge is the same thing with NFS. Then we can finally kill nfsroot ;-) Hmm. What does it take to mount an NFS partition? Anyway. All I did was wrote a tiny libc that is just a bunch of wrappers for syscalls, and some string functions. Then I just wrote a straight forward C program to do the job. Except for my added kexec call I can compile with glibc :) Now if glibc wouldn't link in 200k of unused crap when you make a trivial static binary I'd much prefer to use it... Though I wish it was possible to have a ramfs preloader instead of initrd. An initramfs would allow me to not even compile in the block device driver layer, and be more efficient. A discussion on l-k two months ago revealed that someone actually had made a patch that took a tarball (masquaraded as an initrd image) and unpacked it into a ramfs. I've got the mail samewhere if you want it. /Anders - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] swap=device kernel commandline
Hi1 Did you try to load an initrd on a low-memory machine? It shouldn't work and it probably won't ;) You must be really low on memory ;-) # zcat initrd.gz | wc -c 409600 (ash, pwd, chroot, pivot_root, smount, and still about 82 kB free.) Your solution requires 400K initrd _plus_ memory for ash and swapon. That might be easily 600K total. Yes I could imagine machine with freemem less than that. However such machines do not usually have swap available. Pavel -- Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt, details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] swap=device kernel commandline
Hi, The Sat, Nov 18, 2000 at 01:46:40PM +0200, Kaj-Michael Lang wrote : This patch adds a swap kernel commandline option, so that you can add a swap partition before init starts running on a low-memory machine. Did you try and add swap from an initrd image ? It should work and it's already there. -- Ueimor - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] swap=device kernel commandline
On Sat, 18 Nov 2000, Francois romieu wrote: The Sat, Nov 18, 2000 at 01:46:40PM +0200, Kaj-Michael Lang wrote : This patch adds a swap kernel commandline option, so that you can add a swap partition before init starts running on a low-memory machine. ^^ Did you try and add swap from an initrd image ? It should work and it's already there. Did you try to load an initrd on a low-memory machine? It shouldn't work and it probably won't ;) regards, Rik -- "What you're running that piece of shit Gnome?!?!" -- Miguel de Icaza, UKUUG 2000 http://www.conectiva.com/ http://www.surriel.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] swap=device kernel commandline
Rik van Riel wrote: Did you try to load an initrd on a low-memory machine? It shouldn't work and it probably won't ;) You must be really low on memory ;-) # zcat initrd.gz | wc -c 409600 (ash, pwd, chroot, pivot_root, smount, and still about 82 kB free.) - Werner -- _ / Werner Almesberger, ICA, EPFL, CH [EMAIL PROTECTED] / /_IN_N_032__Tel_+41_21_693_6621__Fax_+41_21_693_6610_/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] swap=device kernel commandline
Werner Almesberger [EMAIL PROTECTED] writes: Rik van Riel wrote: Did you try to load an initrd on a low-memory machine? It shouldn't work and it probably won't ;) You must be really low on memory ;-) # zcat initrd.gz | wc -c 409600 (ash, pwd, chroot, pivot_root, smount, and still about 82 kB free.) Hmm And that's without trying to be small. I have one that loads a second kernel over the network using dhcp to configure it's interface and tftp to fetch the image and boots that is only 20kb uncompressed Compressed I can fit that and a kernel all in plus a minimal BIOS all in 512K with some room to spare... Eric - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] swap=device kernel commandline
Eric W. Biederman wrote: I have one that loads a second kernel over the network using dhcp to configure it's interface and tftp to fetch the image and boots that is only 20kb uncompressed Neat ;-) My goal is actually not only size, but also to have a relatively normal build environment, e.g. my example is with shared newlib, regular ash, and - unfortunately rather wasteful - glibc's ld.so. But a tftp loader in 20kB is rather good. Now the next challenge is the same thing with NFS. Then we can finally kill nfsroot ;-) - Werner -- _ / Werner Almesberger, ICA, EPFL, CH [EMAIL PROTECTED] / /_IN_N_032__Tel_+41_21_693_6621__Fax_+41_21_693_6610_/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
