On Mon, 10 Jan 2000, Zack Weinberg wrote:
>On Mon, Jan 10, 2000 at 08:49:10PM +0100, Andrea Arcangeli wrote:
>> On Sun, 9 Jan 2000, Zack Weinberg wrote:
>>
>> >+ && !(new = __get_free_pages(GFP_USER, order)))
>>
>> mm fragmentation and the VM not good in handling a fragmented mm is going
>> to hurt you.
>
>I was under the impression __get_free_pages allocated physically contiguous
>memory.
Your impression is correct and that's the source of the mm fragmentation
trouble.
>Do you know how to limit the size of AF_UNIX packets? I would like to try
You set it by hand: set sock opt SO_SNDBUF plus sysclt_*mem_max.
For stream AF_UNIX sockets you fallback to 1 page if the allocation fails
so you don't know. For dgram sockets you'll have to do the full allocation
in one packet or you'll wait.
Andrea
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