DPDK patches and discussions
 help / color / mirror / Atom feed
From: "Doherty, Declan" <declan.doherty@intel.com>
To: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v2 1/4] Link Bonding Library
Date: Fri, 6 Jun 2014 09:07:23 +0000	[thread overview]
Message-ID: <345C63BAECC1AD42A2EC8C63AFFC3ADC13D3737A@IRSMSX101.ger.corp.intel.com> (raw)
In-Reply-To: <20140605081557.42a797e8@nehalam.linuxnetplumber.net>

> -----Original Message-----
> From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> Sent: Thursday, June 5, 2014 4:16 PM
> To: Doherty, Declan
> Cc: dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v2 1/4] Link Bonding Library
> 
> On Wed,  4 Jun 2014 16:18:02 +0100
> declan.doherty@intel.com wrote:
> 
> > From: Declan Doherty <declan.doherty@intel.com>
> >
> > - Broadcast TX burst broadcast bug fix
> > - Add/remove slave behavior fix
> > - Checkpatch fixes
> >
> > Signed-off-by: Declan Doherty <declan.doherty@intel.com>
> 
> There are some pretty weak hash functions in there.
> 
> What about using:
> .....

Hi Stephen,

I suppose the naming of these as hash functions is probably misleading, the aim is not to create a unique hash for each flow with minimal collisions but to  help balance traffic flows across the slaves of the bonded device, and as we are doing a modulus calculation based on the number of slaves attached, which I believe will typically be in the 2-4 range, I'm not sure that a stronger hashing function will give a better balance of flows across the slaves. For example in the Linux kernel implementation of the link bonding driver the mac hashing only uses the last byte of src & dst mac addresses to calculate it's eth hash.

/* L2 hash helper */
static inline u32 bond_eth_hash(struct sk_buff *skb)
{
	struct ethhdr *data = (struct ethhdr *)skb->data;

	if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
		return data->h_dest[5] ^ data->h_source[5];

	return 0;
}

I'll investigate and see if a stronger hashing function will result in a better balancing of flows.
--------------------------------------------------------------
Intel Shannon Limited
Registered in Ireland
Registered Office: Collinstown Industrial Park, Leixlip, County Kildare
Registered Number: 308263
Business address: Dromore House, East Park, Shannon, Co. Clare

This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.

  reply	other threads:[~2014-06-06  9:07 UTC|newest]

Thread overview: 127+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-28 15:32 [dpdk-dev] [PATCH 0/4] " declan.doherty
2014-05-28 15:32 ` [dpdk-dev] [PATCH 1/4] " declan.doherty
2014-05-28 16:54   ` Shaw, Jeffrey B
2014-05-29 13:32     ` Doherty, Declan
2014-05-28 15:32 ` [dpdk-dev] [PATCH 2/4] Link bonding unit tests declan.doherty
2014-05-28 15:32 ` [dpdk-dev] [PATCH 3/4] Link bonding integration into testpmd declan.doherty
2014-05-28 15:32 ` [dpdk-dev] [PATCH 4/4] Add Link Bonding Library to Doxygen declan.doherty
2014-05-28 17:49 ` [dpdk-dev] [PATCH 0/4] Link Bonding Library Neil Horman
2014-05-29 10:33   ` Doherty, Declan
2014-05-29 11:33     ` Neil Horman
2014-05-29  3:23 ` Cao, Waterman
2014-05-29 10:35   ` Doherty, Declan
2014-06-04 15:18 ` [dpdk-dev] [PATCH v2 " declan.doherty
2014-06-04 15:18   ` [dpdk-dev] [PATCH v2 1/4] " declan.doherty
2014-06-04 15:18     ` declan.doherty
2014-06-05 15:15     ` Stephen Hemminger
2014-06-06  9:07       ` Doherty, Declan [this message]
2014-06-06 15:13         ` Stephen Hemminger
2014-06-09 21:11     ` Eric Kinzie
2014-06-13 14:03       ` Doherty, Declan
2014-06-04 15:18   ` [dpdk-dev] [PATCH v2 2/4] Link bonding unit tests, including: - code to generate packet bursts for testing rx and tx functionality of bonded device - virtual/stubbed out ethdev for use as slave ethdev in testing - checkpack fixes declan.doherty
2014-06-04 15:18     ` declan.doherty
2014-06-04 15:18   ` [dpdk-dev] [PATCH v2 0/4] Link Bonding Library declan.doherty
2014-06-04 15:18   ` [dpdk-dev] [PATCH v2 3/4] Adding link bonding support to testpmd. - Includes the ability to create new bonded devices. - Add /remove bonding slave devices. - Interogate bonded device stats/configuration - Change bonding modes and select balance transmit polices declan.doherty
2014-06-04 15:18   ` [dpdk-dev] [PATCH v2 4/4] Add Link Bonding Library to Doxygen declan.doherty
2014-06-04 16:10   ` [dpdk-dev] [PATCH v2 0/4] Link Bonding Library Doherty, Declan
2014-06-05  8:03   ` De Lara Guarch, Pablo
2014-06-05 11:03   ` Neil Horman
2014-06-06  8:23     ` Doherty, Declan
2014-06-06 14:54       ` Neil Horman
2014-06-13 14:56         ` Doherty, Declan
2014-06-13 15:11           ` Neil Horman
2014-06-06  3:26   ` Cao, Waterman
2014-06-11 16:33   ` Thomas Monjalon
2014-06-13 14:08     ` Doherty, Declan
2014-06-13 15:15       ` Thomas Monjalon
2014-06-13 14:41 ` [dpdk-dev] [PATCH v3 0/5] Link Bonding PMD Library Declan Doherty
2014-06-13 14:41   ` [dpdk-dev] [PATCH v3 1/5] " Declan Doherty
2014-06-13 14:41   ` [dpdk-dev] [PATCH v3 2/5] Link Bonding PMD Library (librte_eal/librte_ether link bonding support changes) Declan Doherty
2014-06-13 16:08     ` Neil Horman
2014-06-13 18:34       ` Doherty, Declan
2014-06-13 19:38         ` Neil Horman
2014-06-16  8:59           ` Doherty, Declan
2014-06-16 11:07             ` Neil Horman
2014-06-16 16:17               ` Richardson, Bruce
2014-06-16 17:47                 ` Neil Horman
2014-06-16 18:07                   ` Richardson, Bruce
2014-06-16 18:09                   ` Thomas Monjalon
2014-06-13 21:59     ` Stephen Hemminger
2014-06-16  7:59       ` Doherty, Declan
2014-06-13 14:42   ` [dpdk-dev] [PATCH v3 3/5] Link Bonding PMD Library (Unit Test Suite) Declan Doherty
2014-06-13 14:42   ` [dpdk-dev] [PATCH v3 4/5] Link Bonding PMD Library (testpmd link bonding API support) Declan Doherty
2014-06-13 14:42   ` [dpdk-dev] [PATCH v3 5/5] Link Bonding PMD Library (Doxygen Additions) Declan Doherty
2014-06-13 15:20   ` [dpdk-dev] [PATCH v3 0/5] Link Bonding PMD Library Neil Horman
2014-06-16 11:18   ` [dpdk-dev] [PATCH v4 0/6] Link Bonding Library Declan Doherty
2014-06-18 16:14     ` [dpdk-dev] [PATCH v5 " Declan Doherty
2014-06-18 16:18       ` Neil Horman
2014-06-24 14:52       ` [dpdk-dev] [PATCH v6 " Declan Doherty
2014-06-24 16:03         ` [dpdk-dev] [PATCH v7 " Declan Doherty
2014-06-25 20:07           ` [dpdk-dev] [PATCH v8 " Declan Doherty
2014-06-26 16:02             ` De Lara Guarch, Pablo
2014-06-26 23:57             ` [dpdk-dev] [PATCH v9 0/5] link bonding Thomas Monjalon
2014-06-26 23:57               ` [dpdk-dev] [PATCH v9 1/5] bond: new link bonding library Thomas Monjalon
2014-06-27  0:45                 ` Thomas Monjalon
2014-06-26 23:57               ` [dpdk-dev] [PATCH v9 2/5] ethdev: add unique name to devices Thomas Monjalon
2014-06-26 23:57               ` [dpdk-dev] [PATCH v9 3/5] eal: support link bonding device initialization Thomas Monjalon
2014-06-26 23:57               ` [dpdk-dev] [PATCH v9 4/5] bond: unit tests Thomas Monjalon
2014-06-26 23:57               ` [dpdk-dev] [PATCH v9 5/5] bond: testpmd support Thomas Monjalon
2014-06-27 10:18               ` [dpdk-dev] [PATCH v10 0/5] link bonding Declan Doherty
2014-06-27 20:58                 ` Thomas Monjalon
2014-06-29 17:49                 ` [dpdk-dev] [PATCH v11 0/5] link bonding library Declan Doherty
2014-06-30  9:21                   ` Thomas Monjalon
2014-06-30  9:28                     ` Doherty, Declan
2014-07-01 22:01                       ` Thomas Monjalon
2014-06-29 17:49                 ` [dpdk-dev] [PATCH v11 1/5] bond: new " Declan Doherty
2014-06-30  9:13                   ` Thomas Monjalon
2014-06-30 22:29                   ` Robert Sanford
2014-07-01 14:16                     ` Thomas Monjalon
2014-07-01 14:19                     ` Doherty, Declan
2014-07-01 14:26                       ` Thomas Monjalon
2014-06-29 17:49                 ` [dpdk-dev] [PATCH v11 2/5] ethdev: add unique name to devices Declan Doherty
2014-06-29 17:49                 ` [dpdk-dev] [PATCH v11 3/5] eal: support link bonding device initialization Declan Doherty
2014-06-29 17:49                 ` [dpdk-dev] [PATCH v11 4/5] bond: unit tests Declan Doherty
2014-06-30  8:56                   ` Thomas Monjalon
2014-06-29 17:49                 ` [dpdk-dev] [PATCH v11 5/5] bond: testpmd support Declan Doherty
2014-06-27 10:18               ` [dpdk-dev] [PATCH v10 1/5] bond: new link bonding library Declan Doherty
2014-06-27 10:18               ` [dpdk-dev] [PATCH v10 2/5] ethdev: add unique name to devices Declan Doherty
2014-06-27 10:18               ` [dpdk-dev] [PATCH v10 3/5] eal: support link bonding device initialization Declan Doherty
2014-06-27 10:18               ` [dpdk-dev] [PATCH v10 4/5] bond: unit tests Declan Doherty
2014-06-27 10:18               ` [dpdk-dev] [PATCH v10 5/5] bond: testpmd support Declan Doherty
2014-06-25 20:07           ` [dpdk-dev] [PATCH v8 1/6] Link Bonding Library (lib/librte_pmd_bond) Declan Doherty
2014-06-25 20:07           ` [dpdk-dev] [PATCH v8 2/6] Support for unique interface naming of pmds Declan Doherty
2014-06-25 20:07           ` [dpdk-dev] [PATCH v8 3/6] EAL support for link bonding device initialization Declan Doherty
2014-06-25 20:07           ` [dpdk-dev] [PATCH v8 4/6] Link bonding Unit Tests Declan Doherty
2014-06-25 20:07           ` [dpdk-dev] [PATCH v8 5/6] testpmd link bonding additions Declan Doherty
2014-06-25 20:07           ` [dpdk-dev] [PATCH v8 6/6] Link Bonding Library doxygen additions Declan Doherty
2014-06-24 16:03         ` [dpdk-dev] [PATCH v7 1/6] Link Bonding Library (lib/librte_pmd_bond) Declan Doherty
2014-06-24 16:03         ` [dpdk-dev] [PATCH v7 2/6] Support for unique interface naming of pmds Declan Doherty
2014-06-24 16:03         ` [dpdk-dev] [PATCH v7 3/6] EAL support for link bonding device initialization Declan Doherty
2014-06-25 13:54           ` Thomas Monjalon
2014-06-25 14:41             ` Doherty, Declan
2014-06-25 16:00               ` Thomas Monjalon
2014-06-25 16:15                 ` Richardson, Bruce
2014-06-24 16:03         ` [dpdk-dev] [PATCH v7 4/6] Link bonding Unit Tests Declan Doherty
2014-06-24 16:03         ` [dpdk-dev] [PATCH v7 5/6] testpmd link bonding additions Declan Doherty
2014-06-24 16:03         ` [dpdk-dev] [PATCH v7 6/6] Link Bonding Library doxygen additions Declan Doherty
2014-06-25 13:43           ` Thomas Monjalon
2014-06-25 14:19             ` Doherty, Declan
2014-06-25 14:23               ` Thomas Monjalon
2014-06-24 14:52       ` [dpdk-dev] [PATCH v6 1/6] Link Bonding Library (lib/librte_pmd_bond) Declan Doherty
2014-06-24 14:52       ` [dpdk-dev] [PATCH v6 2/6] Support for unique interface naming of pmds Declan Doherty
2014-06-24 14:52       ` [dpdk-dev] [PATCH v6 3/6] EAL support for link bonding device initialization Declan Doherty
2014-06-24 14:52       ` [dpdk-dev] [PATCH v6 4/6] Link bonding Unit Tests Declan Doherty
2014-06-24 14:52       ` [dpdk-dev] [PATCH v6 5/6] testpmd link bonding additions Declan Doherty
2014-06-24 14:52       ` [dpdk-dev] [PATCH v6 6/6] Link Bonding Library doxygen additions Declan Doherty
2014-06-18 16:14     ` [dpdk-dev] [PATCH v5 1/6] Link Bonding Library (lib/librte_pmd_bond) Declan Doherty
2014-06-18 16:14     ` [dpdk-dev] [PATCH v5 2/6] Support for unique interface naming of pmds Declan Doherty
2014-06-18 16:14     ` [dpdk-dev] [PATCH v5 3/6] EAL support for link bonding device initialization Declan Doherty
2014-06-18 16:14     ` [dpdk-dev] [PATCH v5 4/6] Link bonding Unit Tests Declan Doherty
2014-06-18 16:14     ` [dpdk-dev] [PATCH v5 5/6] testpmd link bonding additions Declan Doherty
2014-06-18 16:14     ` [dpdk-dev] [PATCH v5 6/6] Link Bonding Library doxygen additions Declan Doherty
2014-06-16 11:18   ` [dpdk-dev] [PATCH v4 1/6] Link Bonding Library (lib/librte_pmd_bond) initial release with support for Mode 0 - Round Robin Mode 1 - Active Backup Mode 2 - Balance -> Supports 3 transmit polices (layer 2, layer 2+3, la Mode 3 - Broadcast Declan Doherty
2014-06-16 11:18   ` [dpdk-dev] [PATCH v4 2/6] Support for unique interface naming of pmds Declan Doherty
2014-06-16 11:18   ` [dpdk-dev] [PATCH v4 3/6] EAL support for link bonding device initialization Declan Doherty
2014-06-16 11:18   ` [dpdk-dev] [PATCH v4 4/6] Link bonding Unit Tests Declan Doherty
2014-06-16 11:18   ` [dpdk-dev] [PATCH v4 5/6] testpmd link bonding additions Declan Doherty
2014-06-16 11:18   ` [dpdk-dev] [PATCH v4 6/6] Link Bonding Library doxygen additions Declan Doherty

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=345C63BAECC1AD42A2EC8C63AFFC3ADC13D3737A@IRSMSX101.ger.corp.intel.com \
    --to=declan.doherty@intel.com \
    --cc=dev@dpdk.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).