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edc1b01cd3
Stream protocols such as TCP can often build up a backlog of data to be read due to ordering. Combine this with the fact that some workloads such as NFS read()-intensive workloads need to receive a lot of data per RPC call, and it turns out that receiving the data from inside a softirq context can cause starvation. The following patch moves the TCP data receive into a workqueue context. We still end up calling tcp_read_sock(), but we do so from a process context, meaning that softirqs are enabled for most of the time. With this patch, I see a doubling of read bandwidth when running a multi-threaded iozone workload between a virtual client and server setup. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
87 lines
1.6 KiB
C
87 lines
1.6 KiB
C
/*
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* linux/include/linux/sunrpc/xprtsock.h
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*
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* Declarations for the RPC transport socket provider.
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*/
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#ifndef _LINUX_SUNRPC_XPRTSOCK_H
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#define _LINUX_SUNRPC_XPRTSOCK_H
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#ifdef __KERNEL__
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int init_socket_xprt(void);
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void cleanup_socket_xprt(void);
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#define RPC_MIN_RESVPORT (1U)
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#define RPC_MAX_RESVPORT (65535U)
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#define RPC_DEF_MIN_RESVPORT (665U)
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#define RPC_DEF_MAX_RESVPORT (1023U)
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struct sock_xprt {
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struct rpc_xprt xprt;
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/*
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* Network layer
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*/
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struct socket * sock;
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struct sock * inet;
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/*
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* State of TCP reply receive
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*/
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__be32 tcp_fraghdr,
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tcp_xid,
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tcp_calldir;
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u32 tcp_offset,
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tcp_reclen;
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unsigned long tcp_copied,
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tcp_flags;
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/*
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* Connection of transports
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*/
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unsigned long sock_state;
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struct delayed_work connect_worker;
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struct work_struct recv_worker;
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struct mutex recv_mutex;
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struct sockaddr_storage srcaddr;
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unsigned short srcport;
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/*
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* UDP socket buffer size parameters
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*/
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size_t rcvsize,
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sndsize;
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/*
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* Saved socket callback addresses
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*/
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void (*old_data_ready)(struct sock *);
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void (*old_state_change)(struct sock *);
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void (*old_write_space)(struct sock *);
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void (*old_error_report)(struct sock *);
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};
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/*
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* TCP receive state flags
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*/
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#define TCP_RCV_LAST_FRAG (1UL << 0)
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#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
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#define TCP_RCV_COPY_XID (1UL << 2)
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#define TCP_RCV_COPY_DATA (1UL << 3)
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#define TCP_RCV_READ_CALLDIR (1UL << 4)
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#define TCP_RCV_COPY_CALLDIR (1UL << 5)
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/*
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* TCP RPC flags
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*/
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#define TCP_RPC_REPLY (1UL << 6)
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#define XPRT_SOCK_CONNECTING 1U
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#endif /* __KERNEL__ */
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#endif /* _LINUX_SUNRPC_XPRTSOCK_H */
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