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net: mana: Increase the DEF_RX_BUFFERS_PER_QUEUE to 1024

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Through some experiments, we found out that increasing the default
RX buffers count from 512 to 1024, gives slightly better throughput
and significantly reduces the no_wqe_rx errs on the receiver side.
Along with these, other parameters like cpu usage, retrans seg etc
also show some improvement with 1024 value.

Following are some snippets from the experiments

ntttcp tests with 512 Rx buffers
---------------------------------------
connections|  throughput|  no_wqe errs|
---------------------------------------
1          |  40.93Gbps | 123,211     |
16         | 180.15Gbps | 190,120     |
128        | 180.20Gbps | 173,508     |
256        | 180.27Gbps | 189,884     |

ntttcp tests with 1024 Rx buffers
---------------------------------------
connections|  throughput|  no_wqe errs|
---------------------------------------
1          |  44.22Gbps | 19,864      |
16         | 180.19Gbps | 4,430       |
128        | 180.21Gbps | 2,560       |
256        | 180.29Gbps | 1,529       |

So, increasing the default RX buffers per queue count to 1024

Signed-off-by: Shradha Gupta <shradhagupta@linux.microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Link: https://patch.msgid.link/1727667875-29908-1-git-send-email-shradhagupta@linux.microsoft.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Shradha Gupta 2024-09-29 20:44:35 -07:00 committed by Paolo Abeni
parent 7c2f1c2690
commit e26a0c5d82
1 changed files with 1 additions and 1 deletions
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2
include/net/mana/mana.h
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@ -43,7 +43,7 @@ enum TRI_STATE {
* size beyond this value gets rejected by __alloc_page() call.
*/
#define MAX_RX_BUFFERS_PER_QUEUE 8192
#define DEF_RX_BUFFERS_PER_QUEUE 512
#define DEF_RX_BUFFERS_PER_QUEUE 1024
#define MIN_RX_BUFFERS_PER_QUEUE 128
/* This max value for TX buffers is derived as the maximum allocatable