netdev - [PATCH net] ibmveth: Reduce maximum tx queues to 8

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20221102153040.149244-1-nnac123@linux.ibm.com>
Date:   Wed,  2 Nov 2022 10:30:40 -0500
From:   Nick Child <nnac123@...ux.ibm.com>
To:     netdev@...r.kernel.org
Cc:     nick.child@....com, bjking1@...ux.ibm.com, ricklind@...ibm.com,
        dave.taht@...il.com, Nick Child <nnac123@...ux.ibm.com>
Subject: [PATCH net] ibmveth: Reduce maximum tx queues to 8

Previously, the maximum number of transmit queues
allowed was 16. Due to resource concerns, limit
to 8 queues instead.

Since the driver is virtualized away from the
physical NIC, the purpose of multiple queues is
purely to allow for parallel calls to the
hypervisor. Therefore, there is no noticeable
effect on performance by reducing queue count to 8.

Reported-by: Reported-by: Dave Taht <dave.taht@...il.com>
Signed-off-by: Nick Child <nnac123@...ux.ibm.com>
---
Relevant links:
 - Introduce multiple tx queues (accepted in v6.1):
   https://lore.kernel.org/netdev/20220928214350.29795-2-nnac123@linux.ibm.com/
 - Resource concerns with 16 queues:
   https://lore.kernel.org/netdev/CAA93jw5reJmaOvt9vw15C1fo1AN7q5jVKzUocbAoNDC-cpi=KQ@mail.gmail.com/

 drivers/net/ethernet/ibm/ibmveth.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmveth.h b/drivers/net/ethernet/ibm/ibmveth.h
index 4f8357187292..6b5faf1feb0b 100644
--- a/drivers/net/ethernet/ibm/ibmveth.h
+++ b/drivers/net/ethernet/ibm/ibmveth.h
@@ -99,7 +99,7 @@ static inline long h_illan_attributes(unsigned long unit_address,
 #define IBMVETH_FILT_LIST_SIZE 4096
 #define IBMVETH_MAX_BUF_SIZE (1024 * 128)
 #define IBMVETH_MAX_TX_BUF_SIZE (1024 * 64)
-#define IBMVETH_MAX_QUEUES 16U
+#define IBMVETH_MAX_QUEUES 8U
 
 static int pool_size[] = { 512, 1024 * 2, 1024 * 16, 1024 * 32, 1024 * 64 };
 static int pool_count[] = { 256, 512, 256, 256, 256 };
-- 
2.31.1