Am Montag, 10. Januar 2011, 19:16:00 schrieb Andrew: > 10.01.2011 20:04, KP Kirchdoerfer пишет: > > Am Donnerstag, 6. Januar 2011, 15:44:37 schrieb KP Kirchdoerfer: > >> Am Donnerstag, 6. Januar 2011, 15:06:42 schrieb Andrew: > >>> 06.01.2011 15:56, KP Kirchdoerfer пишет: > >>>> Hi; > >>>> > >>>> this is from an old mail, but I tested today what happens if > >>>> Bering-uClibc3 runs out of memory and what happens on Bering-uClibc4 > >>>> box. > >>>> > >>>> Am Samstag, 12. Juni 2010, 20:17:49 schrieb Andrew: > >>>>> Hi. > >>>>> I just finished migration from compressed minix initrd to initramfs > >>>>> that uses compressed as cpio.gz archive with files. > >>>>> I'm done this due to several reasons: > >>>>> 1) Support for multiple initrd files (so, it'll be possible to split > >>>>> initrd module packages); > >>>>> 2) It's much easier to repack .cpio archive, and minix driver can be > >>>>> excluded from kernels (both LEAF and host) > >>>>> > >>>>> Due to migration I omitted diverting of rootfs into separate ramdisk > >>>>> - IMHO it's really unuseful in that case; rootfs with it's default > >>>>> size will take up to half of available RAM during filling - so it'll > >>>>> be enough big, and it'll .never consume all available memory. (I > >>>>> check this, it's working) > >>>>> > >>>>> One of it's cons that I found - there is no initramfs usage > >>>>> statistics in output of 'df'. > >>>> > >>>> I simulated running out of space with dd > >>>> dd if=/dev/zero of=output.file bs=1024 count=1024 > >>>> filling up the memory to the max. > >>>> > >>>> If a Bering-uClibc3 box runs out of memory the dd command fails with > >>>> the message "no disk on space" and refused to generate the last MB. On > >>>> a Bering-uClibc4 it starts to kill processes: > >>>> [36521.153494] Out of memory: kill process 2809 (mini_httpd) score 87 > >>>> or a child > >>>> [36521.160859] Killed process 2809 (mini_httpd) vsz:696kB, > >>>> anon-rss:88kB, file- rss:180kB > >>>> [36521.190261] Out of memory: kill process 2228 (dnsmasq) score 85 or > >>>> a child [36521.197453] Killed process 2228 (dnsmasq) vsz:680kB, > >>>> anon-rss:80kB, file- rss:256kB > >>>> [36521.219629] Out of memory: kill process 2897 (aiccu) score 37 or a > >>>> child [36521.226586] Killed process 2897 (aiccu) vsz:4796kB, > >>>> anon-rss:120kB, file- rss:264kB > >>>> > >>>> This is a serious pb and it may happen that a remote box is > >>>> unavailable even for login via ssh, so you can't just reboot it. > >>>> > >>>> Something I've overlooked? > >>>> kp > >>> > >>> Hmm, it looks like initramfs behavior was changed from 2.6.32 kernel, > >>> and now it hasn't limit in half of available memory. > >>> We can switch back to rootfs on tmpfs, this will require some init > >>> scripts modification. > >> > >> I found a text which describes the pb's I found (don't know how old it > >> is) > >> > >> http://opensource.dyc.edu/ramdisk-vs-ramfs > >> > >> Switching back seems to provide a more stable environement > >> kp > > > > Andrew; > > > > can/will you make the changes necessary? I guess you're the one who knows > > best what has changed moving to initramfs (only) and what needs to be > > done to have initramfs with rootfs. > > > > I consider the issue described above as serious and like to get it > > solved for beta2. > > > > Anything else that anyone considers as showstopper for a new beta > > version? > > > > kp > > Yes, I'll make it in near future. It'll require splitting initrc script > to 2 parts - 1st part for preparing tmpfs and switch_root in it, and 2nd > part - to finish init.
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