* [dpdk-dev] Is it possible to get symmetric hash from RSS for a given flow @ 2014-02-28 0:22 Daniel Kan 2014-02-28 0:24 ` Sangjin Han 0 siblings, 1 reply; 5+ messages in thread From: Daniel Kan @ 2014-02-28 0:22 UTC (permalink / raw) To: dev Hi, It appears that the hash computed from RSS is unidirectional. Hence, for a 5-tuple flow, packet in one direction can be routed to a queue that may be different than packet in the other direction. I’m wondering if there is a configuration or mechanism to get a symmetric hash so that all packets for a given flow will be in the same queue. Thanks in advance. Dan ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [dpdk-dev] Is it possible to get symmetric hash from RSS for a given flow 2014-02-28 0:22 [dpdk-dev] Is it possible to get symmetric hash from RSS for a given flow Daniel Kan @ 2014-02-28 0:24 ` Sangjin Han 2014-02-28 1:04 ` Daniel Kan 0 siblings, 1 reply; 5+ messages in thread From: Sangjin Han @ 2014-02-28 0:24 UTC (permalink / raw) To: Daniel Kan; +Cc: dev Hi, This is exactly what you want: http://www.ndsl.kaist.edu/~shinae/papers/TR-symRSS.pdf Sangjin On Thu, Feb 27, 2014 at 4:22 PM, Daniel Kan <dan@nyansa.com> wrote: > Hi, > It appears that the hash computed from RSS is unidirectional. Hence, for a 5-tuple flow, packet in one direction can be routed to a queue that may be different than packet in the other direction. I'm wondering if there is a configuration or mechanism to get a symmetric hash so that all packets for a given flow will be in the same queue. Thanks in advance. > > Dan ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [dpdk-dev] Is it possible to get symmetric hash from RSS for a given flow 2014-02-28 0:24 ` Sangjin Han @ 2014-02-28 1:04 ` Daniel Kan 2014-02-28 1:08 ` Stefan Baranoff 0 siblings, 1 reply; 5+ messages in thread From: Daniel Kan @ 2014-02-28 1:04 UTC (permalink / raw) To: Sangjin Han; +Cc: dev Thanks, Sangjin. This is exactly i’m looking for. Sorry, I should’ve googled it first. It’s good to know that hash key of repetitive 0x6d5a still yields good load balancing results. Dan On Feb 27, 2014, at 4:24 PM, Sangjin Han <sangjin@eecs.berkeley.edu> wrote: > Hi, > > This is exactly what you want: > http://www.ndsl.kaist.edu/~shinae/papers/TR-symRSS.pdf > > Sangjin > > On Thu, Feb 27, 2014 at 4:22 PM, Daniel Kan <dan@nyansa.com> wrote: >> Hi, >> It appears that the hash computed from RSS is unidirectional. Hence, for a 5-tuple flow, packet in one direction can be routed to a queue that may be different than packet in the other direction. I'm wondering if there is a configuration or mechanism to get a symmetric hash so that all packets for a given flow will be in the same queue. Thanks in advance. >> >> Dan ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [dpdk-dev] Is it possible to get symmetric hash from RSS for a given flow 2014-02-28 1:04 ` Daniel Kan @ 2014-02-28 1:08 ` Stefan Baranoff 2014-02-28 5:34 ` Daniel Kan 0 siblings, 1 reply; 5+ messages in thread From: Stefan Baranoff @ 2014-02-28 1:08 UTC (permalink / raw) To: Daniel Kan; +Cc: dev Has anyone already applied this logic to IP only load balancing to get SRC/DST and DST/SRC on the same queue and come up with an RSK value? If not I'll spend some time with a calculator and see if I can get one. Thanks, Stefan Sent from my smart phone; people don't make typos, Swype does! On Feb 27, 2014 8:04 PM, "Daniel Kan" <dan@nyansa.com> wrote: > Thanks, Sangjin. This is exactly i'm looking for. Sorry, I should've > googled it first. It's good to know that hash key of repetitive 0x6d5a > still yields good load balancing results. > > Dan > > On Feb 27, 2014, at 4:24 PM, Sangjin Han <sangjin@eecs.berkeley.edu> > wrote: > > > Hi, > > > > This is exactly what you want: > > http://www.ndsl.kaist.edu/~shinae/papers/TR-symRSS.pdf > > > > Sangjin > > > > On Thu, Feb 27, 2014 at 4:22 PM, Daniel Kan <dan@nyansa.com> wrote: > >> Hi, > >> It appears that the hash computed from RSS is unidirectional. Hence, > for a 5-tuple flow, packet in one direction can be routed to a queue that > may be different than packet in the other direction. I'm wondering if there > is a configuration or mechanism to get a symmetric hash so that all packets > for a given flow will be in the same queue. Thanks in advance. > >> > >> Dan > > ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [dpdk-dev] Is it possible to get symmetric hash from RSS for a given flow 2014-02-28 1:08 ` Stefan Baranoff @ 2014-02-28 5:34 ` Daniel Kan 0 siblings, 0 replies; 5+ messages in thread From: Daniel Kan @ 2014-02-28 5:34 UTC (permalink / raw) To: Stefan Baranoff; +Cc: dev The symmetric RSK for 5-tuple is a generalized case for 2-tuple src ip/dst ip. You can use the same RSK to get the symmetric load balancing. Dan On Feb 27, 2014, at 5:08 PM, Stefan Baranoff <sbaranoff@gmail.com> wrote: > Has anyone already applied this logic to IP only load balancing to get SRC/DST and DST/SRC on the same queue and come up with an RSK value? If not I'll spend some time with a calculator and see if I can get one. > Thanks, > Stefan > > Sent from my smart phone; people don't make typos, Swype does! > > On Feb 27, 2014 8:04 PM, "Daniel Kan" <dan@nyansa.com> wrote: > Thanks, Sangjin. This is exactly i’m looking for. Sorry, I should’ve googled it first. It’s good to know that hash key of repetitive 0x6d5a still yields good load balancing results. > > Dan > > On Feb 27, 2014, at 4:24 PM, Sangjin Han <sangjin@eecs.berkeley.edu> wrote: > > > Hi, > > > > This is exactly what you want: > > http://www.ndsl.kaist.edu/~shinae/papers/TR-symRSS.pdf > > > > Sangjin > > > > On Thu, Feb 27, 2014 at 4:22 PM, Daniel Kan <dan@nyansa.com> wrote: > >> Hi, > >> It appears that the hash computed from RSS is unidirectional. Hence, for a 5-tuple flow, packet in one direction can be routed to a queue that may be different than packet in the other direction. I'm wondering if there is a configuration or mechanism to get a symmetric hash so that all packets for a given flow will be in the same queue. Thanks in advance. > >> > >> Dan > ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2014-02-28 5:32 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2014-02-28 0:22 [dpdk-dev] Is it possible to get symmetric hash from RSS for a given flow Daniel Kan 2014-02-28 0:24 ` Sangjin Han 2014-02-28 1:04 ` Daniel Kan 2014-02-28 1:08 ` Stefan Baranoff 2014-02-28 5:34 ` Daniel Kan
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