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# This patch fixes tst-cancel4, tst-cancel5, tst-cancelx4 and tst-cancelx5
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# failures on newer kernels where the write buffers are larger.
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#
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# commit e7074e4c5edb0acaa979ea08e533736f906a9d68
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# Author: David S. Miller <davem@davemloft.net>
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# Date: Tue Jul 23 02:31:37 2013 -0700
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#
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# Increase nptl test case buffer size so we really block on current Linux kernels.
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#
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# * tst-cancel4.c (WRITE_BUFFER_SIZE): Increase to 16384.
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#
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# commit 135529b443631f840cc66d0cc395f79c416434d9
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# Author: David S. Miller <davem@davemloft.net>
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# Date: Tue Jul 23 11:31:39 2013 -0700
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#
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# Remove Linux kernel version ambiguity in comment added by previous commit.
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#
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# * tst-cancel4.c (WRITE_BUFFER_SIZE): Adjust comment.
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#
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diff -urN glibc-2.17-c758a686/nptl/tst-cancel4.c glibc-2.17-c758a686/nptl/tst-cancel4.c
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--- glibc-2.17-c758a686/nptl/tst-cancel4.c 2014-07-25 22:07:09.130021164 -0400
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+++ glibc-2.17-c758a686/nptl/tst-cancel4.c 2014-07-25 22:12:07.580022919 -0400
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@@ -83,7 +83,30 @@
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# define IPC_ADDVAL 0
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#endif
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-#define WRITE_BUFFER_SIZE 4096
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+/* The WRITE_BUFFER_SIZE value needs to be choosen such that if we set
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+ the socket send buffer size to '1', a write of this size on that
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+ socket will block.
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+
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+ The Linux kernel imposes a minimum send socket buffer size which
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+ has changed over the years. As of Linux 3.10 the value is:
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+
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+ 2 * (2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff)))
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+
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+ which is attempting to make sure that with standard MTUs,
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+ TCP can always queue up at least 2 full sized packets.
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+
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+ Furthermore, there is logic in the socket send paths that
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+ will allow one more packet (of any size) to be queued up as
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+ long as some socket buffer space remains. Blocking only
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+ occurs when we try to queue up a new packet and the send
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+ buffer space has already been fully consumed.
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+
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+ Therefore we must set this value to the largest possible value of
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+ the formula above (and since it depends upon the size of "struct
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+ sk_buff", it is dependent upon machine word size etc.) plus some
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+ slack space. */
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+
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+#define WRITE_BUFFER_SIZE 16384
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/* Cleanup handling test. */
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static int cl_called;
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