Re: big picture UDP/IP performance question re 2.6.18 -> 2.6.32

2 messages, 2 authors, 2011-10-05 · open the first message on its own page

Re: big picture UDP/IP performance question re 2.6.18 -> 2.6.32

From: <hidden>
Date: 2011-10-03 18:03:57

At 06:16 PM 10/3/2011 +0200, Eric Dumazet wrote:
It seems you use 4096 2MB hugepages, and your
machine has 1GB pages availabe, you could
try to use them.

(boot cmd : hugepagesz=1GB hugepages=8 )
Tried it and got errno 12 on the segment
allocations.  None were allocated, though
the count is six and the largest is exactly
1GB.  Don't have time to dig into it.

Re: big picture UDP/IP performance question re 2.6.18 -> 2.6.32

From: Eric Dumazet <hidden>
Date: 2011-10-05 06:53:54

Le lundi 03 octobre 2011 à 14:02 -0400, starlight@binnacle.cx a écrit :
At 06:16 PM 10/3/2011 +0200, Eric Dumazet wrote:
quoted
It seems you use 4096 2MB hugepages, and your
machine has 1GB pages availabe, you could
try to use them.

(boot cmd : hugepagesz=1GB hugepages=8 )
Tried it and got errno 12 on the segment
allocations.  None were allocated, though
the count is six and the largest is exactly
1GB.  Don't have time to dig into it.
Thats pretty normal ;)

With 2MB pages, your segment size must be a 2MB multiple.

With 1GB pages, your segment size must be a .... 1GB multiple.

So only applicable is say you handle one big 8GB segment for example, or
2 4GB segments... Well you see the picture.
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