netdev - [RFC PATCH 0/1] vmxnet3: Adjust maximum Rx ring buffer size

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Message-ID: <20250105213036.288356-1-atomlin@atomlin.com>
Date: Sun,  5 Jan 2025 21:30:35 +0000
From: Aaron Tomlin <atomlin@...mlin.com>
To: ronak.doshi@...adcom.com,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: bcm-kernel-feedback-list@...adcom.com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	atomlin@...mlin.com
Subject: [RFC PATCH 0/1] vmxnet3: Adjust maximum Rx ring buffer size

Hi Ronak, Paolo,

I managed to trigger the MAX_PAGE_ORDER warning in the context of function
__alloc_pages_noprof() with /usr/sbin/ethtool --set-ring rx 4096 rx-mini
2048 [devname]' using the maximum supported Ring 0 and Rx ring buffer size.
Admittedly this was under the stock Linux kernel-4.18.0-477.27.1.el8_8
whereby CONFIG_CMA is not enabled. I think it does not make sense to
attempt a large memory allocation request for physically contiguous memory,
to hold the Rx Data ring that could exceed the maximum page-order supported
by the system.

I am not familiar with drivers/net/vmxnet3 related code.
Please let me know your thoughts. Thank you.

Aaron Tomlin (1):
  vmxnet3: Adjust maximum Rx ring buffer size

 drivers/net/vmxnet3/vmxnet3_defs.h | 4 ++++
 1 file changed, 4 insertions(+)

-- 
2.47.1