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From: Simon Horman <horms@kernel.org>
To: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Cc: intel-wired-lan@lists.osuosl.org, anthony.l.nguyen@intel.com,
	netdev@vger.kernel.org
Subject: Re: [PATCH iwl-next 1/4] ixgbe: lower IXGBE_ITR_ADAPTIVE_MAX_USECS to prevent RX starvation
Date: Wed, 16 Sep 2026 15:41:24 +0100	[thread overview]
Message-ID: <20260916144124.GM51261@horms.kernel.org> (raw)
In-Reply-To: <20260915125538.3975870-2-aleksandr.loktionov@intel.com>

On Tue, Sep 15, 2026 at 02:55:35PM +0200, Aleksandr Loktionov wrote:
> From: Alexander Duyck <alexander.h.duyck@intel.com>
> 
> At the current maximum of 126 us the minimum bulk-mode interrupt rate
> is ~7936 interrupts/s.  Under sustained full-line-rate bulk RX traffic
> this is low enough that descriptor ring starvation can occur before the
> next interrupt fires.
> 
> Lower IXGBE_ITR_ADAPTIVE_MAX_USECS from 126 to 84 us.  This raises the
> minimum rate to ~11905 interrupts/s (~12K ints/s), providing enough
> headroom to drain the ring before it wraps.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
> Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>

Reviewed-by: Simon Horman <horms@kernel.org>


  reply	other threads:[~2026-09-16 14:41 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-15 12:55 [PATCH iwl-next 0/4] ixgbe: adaptive ITR tuning to prevent RX starvation and ACK overdrive Aleksandr Loktionov
2026-09-15 12:55 ` [PATCH iwl-next 1/4] ixgbe: lower IXGBE_ITR_ADAPTIVE_MAX_USECS to prevent RX starvation Aleksandr Loktionov
2026-09-16 14:41   ` Simon Horman [this message]
2026-09-15 12:55 ` [PATCH iwl-next 2/4] ixgbe: add ixgbe_container_is_rx() helper and refine RX adaptive ITR Aleksandr Loktionov
2026-09-16 14:41   ` Simon Horman
2026-09-15 12:55 ` [PATCH iwl-next 3/4] ixgbe: limit ITR decrease in latency mode to prevent ACK overdrive Aleksandr Loktionov
2026-09-15 12:55 ` [PATCH iwl-next 4/4] ixgbe: add IXGBE_ITR_ADAPTIVE_MASK_USECS constant Aleksandr Loktionov

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