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authorStefano Brivio <sbrivio@redhat.com>2021-04-23 22:22:37 +0200
committerStefano Brivio <sbrivio@redhat.com>2021-04-23 22:22:37 +0200
commit38b50dba4704856194ac02b98e492d2349d64058 (patch)
treeb7f7a12479aa53f9e7ac2cae7a4e709ce78d99a5 /tcp.h
parent962bc97cf116519bd11b7e8beeda6dcce033d537 (diff)
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passt: Spare some syscalls, add some optimisations from profiling
Avoid a bunch of syscalls on forwarding paths by: - storing minimum and maximum file descriptor numbers for each protocol, fall back to SO_PROTOCOL query only on overlaps - allocating a larger receive buffer -- this can result in more coalesced packets than sendmmsg() can take (UIO_MAXIOV, i.e. 1024), so make sure we don't exceed that within a single call to protocol tap handlers - nesting the handling loop in tap_handler() in the receive loop, so that we have better chances of filling our receive buffer in fewer calls - skipping the recvfrom() in the UDP handler on EPOLLERR -- there's nothing to be done in that case and while at it: - restore the 20ms timer interval for periodic (TCP) events, I accidentally changed that to 100ms in an earlier commit - attempt using SO_ZEROCOPY for UDP -- if it's not available, sendmmsg() will succeed anyway - fix the handling of the status code from sendmmsg(), if it fails, we'll try to discard the first message, hence return 1 from the UDP handler Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Diffstat (limited to 'tcp.h')
-rw-r--r--tcp.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/tcp.h b/tcp.h
index da081ad..2a79a75 100644
--- a/tcp.h
+++ b/tcp.h
@@ -12,9 +12,13 @@ void tcp_timer(struct ctx *c, struct timespec *ts);
/**
* struct tcp_ctx - Execution context for TCP routines
* @hash_secret: 128-bit secret for hash functions, ISN and hash table
+ * @fd_min: Lowest file descriptor number for TCP ever used
+ * @fd_max: Highest file descriptor number for TCP ever used
*/
struct tcp_ctx {
uint64_t hash_secret[2];
+ int fd_min;
+ int fd_max;
};
#endif /* TCP_H */