From: David Miller <davem@davemloft.net>
To: bhutchings@solarflare.com
Cc: alexander.h.duyck@intel.com, jeffrey.t.kirsher@intel.com,
netdev@vger.kernel.org, gospo@redhat.com
Subject: Re: [net-next 11/13] igb: Make Tx budget for NAPI user adjustable
Date: Mon, 19 Sep 2011 16:56:12 -0400 (EDT) [thread overview]
Message-ID: <20110919.165612.160169795450854730.davem@davemloft.net> (raw)
In-Reply-To: <1316448352.2764.27.camel@bwh-desktop>
From: Ben Hutchings <bhutchings@solarflare.com>
Date: Mon, 19 Sep 2011 17:05:52 +0100
> But tx_max_coalesced_frames_irq is not supposed to be a work limit (and
> such a work limit doesn't seem useful in the absence of NAPI). As I
> understand it, it is supposed to be an alternate moderation value for
> the hardware to use if a frame is sent while the IRQ handler is running.
Exactly, the ethtool settings modify what the hardware interrupt mechanisms
do, ragardless of whether those hardware interrupts trigger NAPI or not.
And this is precisely what we want, because optimal behavior of NAPI
absoulutely depends upon having the interrupt moderated in hardware
at least a little bit.
next prev parent reply other threads:[~2011-09-19 20:56 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-17 8:04 [net-next 00/13][pull request] Intel Wired LAN Driver Updates Jeff Kirsher
2011-09-17 8:04 ` [net-next 01/13] ixgb: eliminate checkstack warnings Jeff Kirsher
2011-09-17 8:43 ` Joe Perches
2011-09-19 21:36 ` Jesse Brandeburg
2011-09-19 22:28 ` [PATCH] intel: Convert <FOO>_LENGTH_OF_ADDRESS to ETH_ALEN Joe Perches
2011-09-19 23:33 ` Jeff Kirsher
2011-09-17 8:04 ` [net-next 02/13] igb: Update RXDCTL/TXDCTL configurations Jeff Kirsher
2011-09-17 8:04 ` [net-next 03/13] igb: Update max_frame_size to account for an optional VLAN tag if present Jeff Kirsher
2011-09-17 8:04 ` [net-next 04/13] igb: drop support for single buffer mode Jeff Kirsher
2011-09-17 8:04 ` [net-next 05/13] igb: streamline Rx buffer allocation and cleanup Jeff Kirsher
2011-09-17 8:04 ` [net-next 06/13] igb: update ring and adapter structure to improve performance Jeff Kirsher
2011-09-17 8:04 ` [net-next 07/13] igb: Refactor clean_rx_irq to reduce overhead and " Jeff Kirsher
2011-09-17 8:04 ` [net-next 08/13] igb: drop the "adv" off function names relating to descriptors Jeff Kirsher
2011-09-17 8:04 ` [net-next 09/13] igb: Replace E1000_XX_DESC_ADV with IGB_XX_DESC Jeff Kirsher
2011-09-17 8:04 ` [net-next 10/13] igb: Remove multi_tx_table and simplify igb_xmit_frame Jeff Kirsher
2011-09-17 8:04 ` [net-next 11/13] igb: Make Tx budget for NAPI user adjustable Jeff Kirsher
2011-09-17 17:04 ` Ben Hutchings
2011-09-19 15:48 ` Alexander Duyck
2011-09-19 16:05 ` Ben Hutchings
2011-09-19 16:32 ` Alexander Duyck
2011-09-19 21:00 ` David Miller
2011-09-19 22:27 ` Alexander Duyck
2011-09-19 23:36 ` Jeff Kirsher
2011-09-19 23:42 ` Stephen Hemminger
2011-09-19 23:47 ` David Miller
2011-09-20 0:10 ` Ben Hutchings
2011-09-20 18:59 ` Andy Gospodarek
2011-09-20 20:23 ` Neil Horman
2011-09-27 23:45 ` Ben Hutchings
2011-09-28 11:00 ` Neil Horman
2011-09-28 15:11 ` Stephen Hemminger
2011-09-28 17:07 ` Neil Horman
2011-09-19 20:56 ` David Miller [this message]
2011-09-19 20:57 ` David Miller
2011-09-17 8:04 ` [net-next 12/13] igb: split buffer_info into tx_buffer_info and rx_buffer_info Jeff Kirsher
2011-09-17 8:04 ` [net-next 13/13] igb: Consolidate creation of Tx context descriptors into a single function Jeff Kirsher
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