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From: Pavel Fedin <p.fedin@samsung.com>
To: "'Sunil Kovvuri'" <sunil.kovvuri@gmail.com>,
	"'Eric Dumazet'" <eric.dumazet@gmail.com>
Cc: "'Linux Netdev List'" <netdev@vger.kernel.org>,
	"'LKML'" <linux-kernel@vger.kernel.org>,
	"'LAKML'" <linux-arm-kernel@lists.infradead.org>,
	"'Sunil Goutham'" <Sunil.Goutham@caviumnetworks.com>,
	"'Sunil Goutham'" <sgoutham@cavium.com>
Subject: RE: [PATCH 3/6] net: thunderx: Increase transmit queue length
Date: Wed, 02 Dec 2015 15:29:10 +0300	[thread overview]
Message-ID: <013301d12cfd$0c958a90$25c09fb0$@samsung.com> (raw)
In-Reply-To: <00eb01d12cec$a32aa500$e97fef00$@samsung.com>

 Hello!

> >  So, i see several possible ways to solve this:
> >
> > 1. Introduce some mechanism which would allow the driver to tell the kernel that it needs
> > coherent pool of large size. Can be problematic because the driver can be a module, and pool
> > allocation happens early.
> > 2. Can we use some other method for allocating queues, which would not require such a huge
> > coherent pool?
> > 3. The driver could check value of atomic_pool_size and adjust own memory requirements
> > accordingly. This indeed looks like a quick hack, but would at least make things running
> > quickly.
> 
>  I have also noticed that CONFIG_DMA_CMA is turned off in my kernel. I guess it was a leftover
> from old defconfig, because i carry over my .config from version to version. I enabled it and
> rebuilt the kernel, but in order to get the driver working with this patch i had to also add
> cma=32M option to kernel arguments. With default of 16M the allocation still fails.
>  Should we add Kconfig dependencies?

 After getting it working in guest i tried to apply it to host. With total of 128 virtual functions (= 128 interfaces) it does not work at all. Even after bumping cma region size to insane value of 2GB more than half of interfaces still failed to allocate queues. And after setting cma=3G i could not mount my rootfs.
 So, absolute NAK, unfortunately.

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia



  reply	other threads:[~2015-12-02 12:29 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <y@samsung.com>
2012-05-22  5:57 ` [PATCH v3 2/2] regulator: Add support for MAX77686 yadi.brar01
2012-05-23  1:40   ` jonghwa3.lee
2012-05-23  4:16     ` Yadwinder Singh Brar
2012-05-23  4:40       ` jonghwa3.lee
2012-05-23  5:23         ` Yadwinder Singh Brar
2012-05-23  5:33           ` jonghwa3.lee
2012-05-23 10:18             ` Mark Brown
2012-05-23 13:02               ` Yadwinder Singh Brar
2012-05-23  6:08       ` Yadwinder Singh Brar
2012-05-23  1:50   ` jonghwa3.lee
2012-05-23  4:17     ` Yadwinder Singh Brar
2014-07-23  1:40 ` [PATCH] extcon: Add missing REGMAP_I2C/REGMAP_IRQ dependency on extcon driver Chanwoo Choi
2014-07-23  8:20   ` Krzysztof Kozlowski
2014-07-25  8:39   ` Charles Keepax
2014-08-12  2:01 ` [PATCHv2 0/5] rtc: s3c: Refactoring s3c-rtc driver and support Exynos3250 RTC y
2014-08-12  2:01   ` [PATCHv2 1/5] rtc: s3c: Define s3c_rtc structure to remove global variables y
2014-08-22 20:42     ` Andrew Morton
2014-08-25  0:57       ` Chanwoo Choi
2014-08-26 21:31         ` Andrew Morton
2014-08-28  4:49           ` Chanwoo Choi
2014-08-12  2:01   ` [PATCHv2 2/5] rtc: s3c: Remove warning message when checking coding style with checkpatch script y
2014-08-12  2:01   ` [PATCHv2 3/5] rtc: s3c: Add s3c_rtc_data structure to use variant data instead of s3c_cpu_type y
2014-08-12  2:01   ` [PATCHv2 4/5] rtc: s3c: Add support for RTC of Exynos3250 SoC y
2014-08-12  2:01   ` [PATCHv2 5/5] ARM: dts: Fix wrong compatible string of Exynos3250 RTC dt node y
2015-12-01  9:13 ` [PATCH 3/6] net: thunderx: Increase transmit queue length Sunil Goutham
2015-12-01 14:40   ` Pavel Fedin
2015-12-01 15:33     ` Eric Dumazet
2015-12-01 16:30       ` Sunil Kovvuri
2015-12-01 19:30         ` David Miller
2015-12-02  5:48           ` Sunil Kovvuri
2015-12-02 13:25             ` Eric Dumazet
2015-12-02 16:50               ` Sunil Kovvuri
2015-12-02 16:59                 ` Eric Dumazet
2015-12-02 17:31             ` David Miller
2015-12-02  9:05         ` Pavel Fedin
2015-12-02 10:31           ` Pavel Fedin
2015-12-02 12:29             ` Pavel Fedin [this message]
2015-12-02 12:57               ` Sunil Kovvuri
2015-12-02 13:22                 ` Pavel Fedin
2015-12-02  8:09       ` Pavel Fedin
2015-12-01  9:13 ` [PATCH 5/6] net: thunderx: Switchon carrier only upon interface link up Sunil Goutham
2015-12-01 15:32   ` Pavel Fedin
2015-12-01 16:39     ` Sunil Kovvuri
2015-12-07  5:00 ` [PATCH 0/2] net: thunderx: Miscellaneous cleanups Sunil Goutham
2015-12-07 10:33   ` Pavel Fedin
2015-12-07 18:40   ` David Miller
2015-12-09 11:38 ` [PATCH 1/2] net: thunderx: HW TSO support for pass-2 hardware Sunil Goutham
2015-12-09 12:05   ` Pavel Fedin
2015-12-09 12:24     ` Sunil Kovvuri
2015-12-09 20:26     ` David Miller
2015-12-09 11:38 ` [PATCH 2/2] net: thunderx: Enable CQE count threshold interrupt Sunil Goutham
2015-12-09 12:07   ` Pavel Fedin
2015-12-09 12:26     ` Sunil Kovvuri
2015-12-10  7:55 ` [PATCH v2 0/2] net: thunderx: Support for pass-2 hw features Sunil Goutham
2015-12-10  8:52   ` Pavel Fedin
2015-12-12  4:38   ` David Miller

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