From: epsi@gmx.de
To: linux-omap@vger.kernel.org
Subject: Memory performance / Cache problem
Date: Mon, 12 Oct 2009 09:54:09 +0200 [thread overview]
Message-ID: <20091012075409.186580@gmx.net> (raw)
I found the memory performance of newer kernels are quit poor on an EVM-Omap3 board. It works with 2-6 times performance on the old 2.6.22 kernel from TI's PSP.
Possible reasons:
- problem in config the kernel (did omap3_evm_defconfig)
- problem in kernel
- kernel expects some settings from uboot, which are not done there
I have tried the 2.6.29rc3 (from TI's PSP) and the 2.6.31 from git-tree.
Both behave quite simular:
Transport in MByte:
memcpy = 204.073, loop4 = 183.212, loop1 = 81.693, rand =
4.534
while the 22 kernel:
memcpy = 453.932, loop4 = 469.934, loop1 = 125.031, rand =
29.631
Can someone give me help or can at least confirm that?
Best regards
Steffen
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next reply other threads:[~2009-10-12 7:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-12 7:54 epsi [this message]
2009-10-12 8:09 ` Memory performance / Cache problem Dasgupta, Romit
2009-10-12 8:35 ` Siarhei Siamashka
2009-10-13 9:13 ` epsi
-- strict thread matches above, loose matches on Subject: below --
2009-10-12 8:38 epsi
2009-10-12 9:07 ` Dasgupta, Romit
2009-10-12 9:51 ` Dasgupta, Romit
2009-10-12 9:12 ` Premi, Sanjeev
2009-10-14 13:59 ` Woodruff, Richard
2009-10-14 14:48 ` epsi
2009-10-14 17:37 ` Siarhei Siamashka
2009-10-14 17:46 ` Woodruff, Richard
2009-10-15 10:20 ` epsi
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