linux-kernel - Re: problems with e1000 and jumboframes

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Message-ID: <Pine.LNX.4.64.0608031703330.8443@bizon.gios.gov.pl>
Date:	Thu, 3 Aug 2006 17:04:46 +0200 (CEST)
From:	Krzysztof Oledzki <olel@....pl>
To:	Benjamin LaHaise <bcrl@...ck.org>
cc:	Arnd Hannemann <arnd@...dnet.de>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: problems with e1000 and jumboframes



On Thu, 3 Aug 2006, Benjamin LaHaise wrote:

> On Thu, Aug 03, 2006 at 04:49:15PM +0200, Krzysztof Oledzki wrote:
>> With 1 GB of RAM full 1GB/3GB (CONFIG_VMSPLIT_3G_OPT) seems to be
>> enough...
>
> Nope, you lose ~128MB of RAM for vmalloc space.

No sure:

Linux version 2.6.17.7 (root@r1) (gcc version 3.4.6) #1 SMP PREEMPT Fri Jul 28 18:05:40 CEST 2006
BIOS-provided physical RAM map:
  BIOS-e820: 0000000000000000 - 00000000000a0000 (usable)
  BIOS-e820: 0000000000100000 - 000000003ffc0000 (usable)
  BIOS-e820: 000000003ffc0000 - 000000003ffcfc00 (ACPI data)
  BIOS-e820: 000000003ffcfc00 - 000000003ffff000 (reserved)
  BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
  BIOS-e820: 00000000fec00000 - 00000000fec90000 (reserved)
  BIOS-e820: 00000000fed00000 - 00000000fed00400 (reserved)
  BIOS-e820: 00000000fee00000 - 00000000fee10000 (reserved)
  BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved)
1023MB LOWMEM available.
found SMP MP-table at 000fe710
On node 0 totalpages: 262080
   DMA zone: 4096 pages, LIFO batch:0
   Normal zone: 257984 pages, LIFO batch:31
(...)

$ zcat /proc/config.gz |grep VMSPLIT
# CONFIG_VMSPLIT_3G is not set
CONFIG_VMSPLIT_3G_OPT=y
# CONFIG_VMSPLIT_2G is not set
# CONFIG_VMSPLIT_1G is not set


Best regards,

 				Krzysztof Olędzki