Searched hist:268535 (Results 1 - 6 of 6) sorted by relevance
| /freebsd-11-stable/sys/kern/ | ||
| H A D | kern_mbuf.c | diff 268535 Fri Jul 11 17:54:50 MDT 2014 glebius Improve reference counting of EXT_SFBUF pages attached to mbufs. o Do not use UMA refcount zone. The problem with this zone is that several refcounting words (16 on amd64) share the same cache line, and issueing atomic(9) updates on them creates cache line contention. Also, allocating and freeing them is extra CPU cycles. Instead, refcount the page directly via vm_page_wire() and the sfbuf via sf_buf_alloc(sf_buf_page(sf)) [1]. o Call refcounting/freeing function for EXT_SFBUF via direct function call, instead of function pointer. This removes barrier for CPU branch predictor. o Do not cleanup the mbuf to be freed in mb_free_ext(), merely to satisfy assertion in mb_dtor_mbuf(). Remove the assertion from mb_dtor_mbuf(). Use bcopy() instead of manual assignments to copy m_ext in mb_dupcl(). [1] This has some problems for now. Using sf_buf_alloc() merely to increase refcount is expensive, and is broken on sparc64. To be fixed. Sponsored by: Netflix Sponsored by: Nginx, Inc. |
| H A D | uipc_mbuf.c | diff 268535 Fri Jul 11 17:54:50 MDT 2014 glebius Improve reference counting of EXT_SFBUF pages attached to mbufs. o Do not use UMA refcount zone. The problem with this zone is that several refcounting words (16 on amd64) share the same cache line, and issueing atomic(9) updates on them creates cache line contention. Also, allocating and freeing them is extra CPU cycles. Instead, refcount the page directly via vm_page_wire() and the sfbuf via sf_buf_alloc(sf_buf_page(sf)) [1]. o Call refcounting/freeing function for EXT_SFBUF via direct function call, instead of function pointer. This removes barrier for CPU branch predictor. o Do not cleanup the mbuf to be freed in mb_free_ext(), merely to satisfy assertion in mb_dtor_mbuf(). Remove the assertion from mb_dtor_mbuf(). Use bcopy() instead of manual assignments to copy m_ext in mb_dupcl(). [1] This has some problems for now. Using sf_buf_alloc() merely to increase refcount is expensive, and is broken on sparc64. To be fixed. Sponsored by: Netflix Sponsored by: Nginx, Inc. |
| H A D | kern_sendfile.c | diff 268535 Fri Jul 11 17:54:50 MDT 2014 glebius Improve reference counting of EXT_SFBUF pages attached to mbufs. o Do not use UMA refcount zone. The problem with this zone is that several refcounting words (16 on amd64) share the same cache line, and issueing atomic(9) updates on them creates cache line contention. Also, allocating and freeing them is extra CPU cycles. Instead, refcount the page directly via vm_page_wire() and the sfbuf via sf_buf_alloc(sf_buf_page(sf)) [1]. o Call refcounting/freeing function for EXT_SFBUF via direct function call, instead of function pointer. This removes barrier for CPU branch predictor. o Do not cleanup the mbuf to be freed in mb_free_ext(), merely to satisfy assertion in mb_dtor_mbuf(). Remove the assertion from mb_dtor_mbuf(). Use bcopy() instead of manual assignments to copy m_ext in mb_dupcl(). [1] This has some problems for now. Using sf_buf_alloc() merely to increase refcount is expensive, and is broken on sparc64. To be fixed. Sponsored by: Netflix Sponsored by: Nginx, Inc. |
| H A D | uipc_syscalls.c | diff 268535 Fri Jul 11 17:54:50 MDT 2014 glebius Improve reference counting of EXT_SFBUF pages attached to mbufs. o Do not use UMA refcount zone. The problem with this zone is that several refcounting words (16 on amd64) share the same cache line, and issueing atomic(9) updates on them creates cache line contention. Also, allocating and freeing them is extra CPU cycles. Instead, refcount the page directly via vm_page_wire() and the sfbuf via sf_buf_alloc(sf_buf_page(sf)) [1]. o Call refcounting/freeing function for EXT_SFBUF via direct function call, instead of function pointer. This removes barrier for CPU branch predictor. o Do not cleanup the mbuf to be freed in mb_free_ext(), merely to satisfy assertion in mb_dtor_mbuf(). Remove the assertion from mb_dtor_mbuf(). Use bcopy() instead of manual assignments to copy m_ext in mb_dupcl(). [1] This has some problems for now. Using sf_buf_alloc() merely to increase refcount is expensive, and is broken on sparc64. To be fixed. Sponsored by: Netflix Sponsored by: Nginx, Inc. |
| /freebsd-11-stable/sys/netinet/ | ||
| H A D | sctp_syscalls.c | diff 268535 Fri Jul 11 17:54:50 MDT 2014 glebius Improve reference counting of EXT_SFBUF pages attached to mbufs. o Do not use UMA refcount zone. The problem with this zone is that several refcounting words (16 on amd64) share the same cache line, and issueing atomic(9) updates on them creates cache line contention. Also, allocating and freeing them is extra CPU cycles. Instead, refcount the page directly via vm_page_wire() and the sfbuf via sf_buf_alloc(sf_buf_page(sf)) [1]. o Call refcounting/freeing function for EXT_SFBUF via direct function call, instead of function pointer. This removes barrier for CPU branch predictor. o Do not cleanup the mbuf to be freed in mb_free_ext(), merely to satisfy assertion in mb_dtor_mbuf(). Remove the assertion from mb_dtor_mbuf(). Use bcopy() instead of manual assignments to copy m_ext in mb_dupcl(). [1] This has some problems for now. Using sf_buf_alloc() merely to increase refcount is expensive, and is broken on sparc64. To be fixed. Sponsored by: Netflix Sponsored by: Nginx, Inc. |
| /freebsd-11-stable/sys/sys/ | ||
| H A D | mbuf.h | diff 268535 Fri Jul 11 17:54:50 MDT 2014 glebius Improve reference counting of EXT_SFBUF pages attached to mbufs. o Do not use UMA refcount zone. The problem with this zone is that several refcounting words (16 on amd64) share the same cache line, and issueing atomic(9) updates on them creates cache line contention. Also, allocating and freeing them is extra CPU cycles. Instead, refcount the page directly via vm_page_wire() and the sfbuf via sf_buf_alloc(sf_buf_page(sf)) [1]. o Call refcounting/freeing function for EXT_SFBUF via direct function call, instead of function pointer. This removes barrier for CPU branch predictor. o Do not cleanup the mbuf to be freed in mb_free_ext(), merely to satisfy assertion in mb_dtor_mbuf(). Remove the assertion from mb_dtor_mbuf(). Use bcopy() instead of manual assignments to copy m_ext in mb_dupcl(). [1] This has some problems for now. Using sf_buf_alloc() merely to increase refcount is expensive, and is broken on sparc64. To be fixed. Sponsored by: Netflix Sponsored by: Nginx, Inc. |
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