Re: 2.6.10-rc1-mm4 -1 EAGAIN after allocation failure was: Re: Kernel 2.6.9 Multiple Page Allocation Failures

[Nick Piggin <piggin@xxxxxxxxxxxxxxx>]

Stefan Schmidt wrote:

> On Wed, Nov 10, 2004 at 06:58:31AM -0200, Marcelo Tosatti wrote:
>
> > > > > Can you try the following patch, please? It is diffed against 2.6.10-rc1,
> > > I did. No apparent change with mm4 and vm.min_free_kbytes = 8192. I will try
> > > latest bk next.
>
> > > > I set it back to CONFIG_PACKET_MMAP=y and if the application does not freeze
> > > > for some hours at this load we can blame at least this issue (-1 EAGAIN) on
> > > > that parameter.
> > > Nope, that didn't change anything, still getting EAGAIN, checked two times.
> > Its not clear to me - do you have Nick's watermark patch in? 
> Yes i have vm.min_free_kbytes=8192 and Nick's patch in mm4. I'll try
> rc1-bk19 with his restore-atomic-buffer patch in a few minutes.

You'll actually want to increase min_free_kbytes in order to have the same
amount of memory free as 2.6.8 did.

Start by applying my patch and using the default min_free_kbytes. Then 
increase
it until the page allocation failures stop, and let us know what the end 
result
was.

BTW we should probably have a message in the page allocation failure path
to tell people to try increasing /proc/sys/vm/min_free_kbytes...