just found that when kexec 2.6.24-rc7 from RHEL 5.1 kernel got
Your BIOS doesn't leave a aperture memory hole
Please enable the IOMMU option in the BIOS setup
This costs you 64 MB of RAM
Mapping aperture over 65536 KB of RAM @ 20000000
Bad page state in process 'swapper'
page:ffffe20004000018 flags:0x0000000000000000
mapping:0000000000000000 mapcount:1 count:0
Trying to fix it up, but a reboot is needed
Backtrace:
Pid: 0, comm: swapper Not tainted 2.6.24-rc7-smp #1
Call Trace:
[<ffffffff80263fa3>] bad_page+0x63/0x8d
[<ffffffff802640ed>] __free_pages_ok+0x7c/0x2a5
[<ffffffff80ba7161>] free_all_bootmem_core+0xd0/0x198
[<ffffffff80ba3a22>] numa_free_all_bootmem+0x3b/0x76
[<ffffffff80ba30a2>] mem_init+0x4e/0x165
[<ffffffff80b959dc>] start_kernel+0x236/0x2c2
[<ffffffff80b95123>] _sinittext+0x123/0x12a
Bad page state in process 'swapper'
page:ffffe20004000050 flags:0x0000000000000000
mapping:0000000000000000 mapcount:1 count:0
Trying to fix it up, but a reboot is needed
Backtrace:
Pid: 0, comm: swapper Tainted: G B 2.6.24-rc7-smp #1
Call Trace:
[<ffffffff80263fa3>] bad_page+0x63/0x8d
[<ffffffff802640ed>] __free_pages_ok+0x7c/0x2a5
[<ffffffff80ba7161>] free_all_bootmem_core+0xd0/0x198
[<ffffffff80ba3a22>] numa_free_all_bootmem+0x3b/0x76
[<ffffffff80ba30a2>] mem_init+0x4e/0x165
[<ffffffff80b959dc>] start_kernel+0x236/0x2c2
[<ffffffff80b95123>] _sinittext+0x123/0x12a
...
somewhere from 64M
start_kernel
==> mem_init
==> numa_free_all_bootmem
==> free_all_bootmem_node (NODE_DATA(i))
==> free_all_bootmem_core ()
==> __free_pages_boot_mem
==> __free_pages(page, oder)
==>
__free_pages_ok(page, order)
==>
free_pages_check
==> bad_pages...
try to kexec 2.6.23 from RHEL 5.1, will get
Your BIOS doesn't leave a aperture memory hole
Please enable the IOMMU option in the BIOS setup
This costs you 64 MB of RAM ======> reboot
but 2.6.24-rc7 kexec 2.6.24-rc7 is ok.
YH
On Mon, 7 Jan 2008, Yinghai Lu wrote:
> try to kexec 2.6.23 from RHEL 5.1, will get
> Your BIOS doesn't leave a aperture memory hole
> Please enable the IOMMU option in the BIOS setup
> This costs you 64 MB of RAM ======> reboot
>
> but 2.6.24-rc7 kexec 2.6.24-rc7 is ok.
BUG in 2.6.23 kexec?
On Jan 7, 2008 9:50 PM, Christoph Lameter <[email protected]> wrote:
> On Mon, 7 Jan 2008, Yinghai Lu wrote:
>
> > try to kexec 2.6.23 from RHEL 5.1, will get
> > Your BIOS doesn't leave a aperture memory hole
> > Please enable the IOMMU option in the BIOS setup
> > This costs you 64 MB of RAM ======> reboot
> >
> > but 2.6.24-rc7 kexec 2.6.24-rc7 is ok.
>
> BUG in 2.6.23 kexec?
>
>
yeah, that is more worse. it will cause reboot.
YH
On Jan 8, 2008 12:15 AM, Yinghai Lu <[email protected]> wrote:
>
> On Jan 7, 2008 9:50 PM, Christoph Lameter <[email protected]> wrote:
> > On Mon, 7 Jan 2008, Yinghai Lu wrote:
> >
> > > try to kexec 2.6.23 from RHEL 5.1, will get
> > > Your BIOS doesn't leave a aperture memory hole
> > > Please enable the IOMMU option in the BIOS setup
> > > This costs you 64 MB of RAM ======> reboot
> > >
> > > but 2.6.24-rc7 kexec 2.6.24-rc7 is ok.
> >
> > BUG in 2.6.23 kexec?
> >
> >
>
> yeah, that is more worse. it will cause reboot.
>
change mem model from CONFIG_SPARSEMEM_MANUL to
CONFIG_DISCONTIGMEM_MANUAL it will work.
YH
On Jan 8, 2008 2:36 PM, Yinghai Lu <[email protected]> wrote:
>
> On Jan 8, 2008 12:15 AM, Yinghai Lu <[email protected]> wrote:
> >
> > On Jan 7, 2008 9:50 PM, Christoph Lameter <[email protected]> wrote:
> > > On Mon, 7 Jan 2008, Yinghai Lu wrote:
> > >
> > > > try to kexec 2.6.23 from RHEL 5.1, will get
> > > > Your BIOS doesn't leave a aperture memory hole
> > > > Please enable the IOMMU option in the BIOS setup
> > > > This costs you 64 MB of RAM ======> reboot
> > > >
> > > > but 2.6.24-rc7 kexec 2.6.24-rc7 is ok.
> > >
> > > BUG in 2.6.23 kexec?
> > >
> > >
> >
> > yeah, that is more worse. it will cause reboot.
> >
>
> change mem model from CONFIG_SPARSEMEM_MANUL to
> CONFIG_DISCONTIGMEM_MANUAL it will work.
find the cause. because two kernel has different addr for GART aper.
and second kernel will put vmemmap in the GART set by first kernel.
http://lkml.org/lkml/2008/1/10/517
YH