[lkml]   [2006]   [Aug]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC] HOWTO use NAPI to reduce TX interrupts
From: Roland Dreier <>
Date: Mon, 21 Aug 2006 17:29:05 -0700

> This is a digression from spidernet, but what if a device is able to
> generate separate MSIs for TX and RX? Some people from IBM have
> suggested that it is beneficial for throughput to handle TX work and
> RX work for IP-over-InfiniBand in parallel on separate CPUs, and
> handling everything through the ->poll() method would defeat this.

The TX work is so incredibly cheap, relatively speaking, compared
to the full input packet processing path that the RX side runs
that I see no real benefit.

In fact, you might even get better locality due to the way the
locking can be performed if TX reclaim runs inside of ->poll()
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2006-08-22 02:35    [W:0.093 / U:0.492 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site