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| author | Daniil Cherednik <dcherednik@ydb.tech> | 2025-04-24 13:40:22 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2025-04-24 13:40:22 +0200 |
| commit | 08dc695276aa3af8fbbf043e4c3daee326dde145 (patch) | |
| tree | f17eb2f956652504e31784ee4b7d88fb8d223e3d /contrib/libs/openssl/crypto/pem/pem_xaux.c | |
| parent | a8ee862526776543f88be3976c41bd914de2b281 (diff) | |
| download | ydb-main.tar.gz | |
Co-authored-by: Vlad Kuznetsov <va.kuznecov@physics.msu.ru>
Support for MSG_ZEROCOPY feature for XDC stream.
Linux has features which allows to perform send in to socket without copy during send call. MSG_ZEROCOPY is a one of possibility to achieve it.
To use it we must configure net.core.optmem_max kernel option, default values usually not enought. Also process should have capability to lock memory, so consider settings ulimit -l or IPC_LOCK capability.
Note0: MSG_ZEROCOPY causes hiden copy inside kernel when traffic goes between process on the same host. The implementation handle it and disable using MSG_ZEROCOPY for such sessions.
Note1: Some processes using PACKET sockets breaks MSG_ZEROCOPY and also causes hidden copy inside kernel. So consider output `ss -0` in case of non succcess.
Note2: Hardware must support scatter-gather
https://github.com/ydb-platform/ydb/pull/17181#issue-2993455018
Diffstat (limited to 'contrib/libs/openssl/crypto/pem/pem_xaux.c')
0 files changed, 0 insertions, 0 deletions