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3935b9db-cd1d-4151-cc83-08dc8fbe5739 X-MS-Exchange-CrossTenant-AuthSource: DM4PR10MB6111.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jun 2024 17:44:45.4146 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: hFP6GN40s11hqP33y0XeA+cOl2ezvbfYzjis3qm2HsjCnSnQ6CedIp6opTrga1Z0KTzIZCo7xmzKZbWp6r65/9Gcz1sXA4rYDB+hIyjgTYs= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR10MB7956 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-18_02,2024-06-17_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 spamscore=0 mlxlogscore=999 adultscore=0 bulkscore=0 malwarescore=0 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2405010000 definitions=main-2406180131 X-Proofpoint-GUID: X6e6ekE4fxKsaECxq_OgOgOSUUjAXsyD X-Proofpoint-ORIG-GUID: X6e6ekE4fxKsaECxq_OgOgOSUUjAXsyD On 6/16/24 21:14, Leon Romanovsky wrote: > On Fri, Jun 14, 2024 at 01:31:35PM +0530, Anand Khoje wrote: >> In non FLR context, at times CX-5 requests release of ~8 million FW pages. >> This needs humongous number of cmd mailboxes, which to be released once >> the pages are reclaimed. Release of humongous number of cmd mailboxes is >> consuming cpu time running into many seconds. Which with non preemptible >> kernels is leading to critical process starving on that cpu’s RQ. >> To alleviate this, this change restricts the total number of pages >> a worker will try to reclaim maximum 50K pages in one go. >> The limit 50K is aligned with the current firmware capacity/limit of >> releasing 50K pages at once per MLX5_CMD_OP_MANAGE_PAGES + MLX5_PAGES_TAKE >> device command. >> >> Our tests have shown significant benefit of this change in terms of >> time consumed by dma_pool_free(). >> During a test where an event was raised by HCA >> to release 1.3 Million pages, following observations were made: >> >> - Without this change: >> Number of mailbox messages allocated was around 20K, to accommodate >> the DMA addresses of 1.3 million pages. >> The average time spent by dma_pool_free() to free the DMA pool is between >> 16 usec to 32 usec. >> value ------------- Distribution ------------- count >> 256 | 0 >> 512 |@ 287 >> 1024 |@@@ 1332 >> 2048 |@ 656 >> 4096 |@@@@@ 2599 >> 8192 |@@@@@@@@@@ 4755 >> 16384 |@@@@@@@@@@@@@@@ 7545 >> 32768 |@@@@@ 2501 >> 65536 | 0 >> >> - With this change: >> Number of mailbox messages allocated was around 800; this was to >> accommodate DMA addresses of only 50K pages. >> The average time spent by dma_pool_free() to free the DMA pool in this case >> lies between 1 usec to 2 usec. >> value ------------- Distribution ------------- count >> 256 | 0 >> 512 |@@@@@@@@@@@@@@@@@@ 346 >> 1024 |@@@@@@@@@@@@@@@@@@@@@@ 435 >> 2048 | 0 >> 4096 | 0 >> 8192 | 1 >> 16384 | 0 >> >> Signed-off-by: Anand Khoje >> --- >> Changes in v3: >> - Shifted the logic to function req_pages_handler() as per >> Leon's suggestion. >> --- >> drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c | 7 ++++++- >> 1 file changed, 6 insertions(+), 1 deletion(-) >> > The title has extra space: > "net/mlx5 : Reclaim max 50K pages at once" -> "net/mlx5: Reclaim max 50K pages at once" > > But the code looks good to me. > > Thanks, > Reviewed-by: Leon Romanovsky Hi Leon, Thanks for providing the R-B. Should I send a v4 with the fix for the extra space issue? -Anand