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From a83b3ec1d7ce2d656a4c476d65486371d1a659b2 Mon Sep 17 00:00:00 2001
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From: Carlos Maiolino <cmaiolino@redhat.com>
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Date: Tue, 2 May 2017 12:46:10 +0200
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Subject: [PATCH] From 4f8f034a8969a48f210bf00be78a67cfb6964c72 Mon Sep 17
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00:00:00 2001 From: Carlos Maiolino
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<cmaiolino-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Date: Thu, 20 Apr 2017
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14:53:01 +0200 Subject: [PATCH] make buffer size match kernel max transfer
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size
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Currently libfuse has a hardcoded buffer limit to 128kib, while fuse
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kernel module has a limit up to 32 pages.
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This patch changes buffer limit to match the current page size, instead
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of assuming 4096 bytes pages, enabling architectures with bigger pages
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to use larger buffers, improving performance.
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Also, add a new macro (HEADER_SIZE) to specify the space needed to
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accommodate the header, making it easier to understand why those extra
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4096 bytes are needed
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Signed-off-by: Carlos Maiolino <cmaiolino-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
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---
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lib/fuse_kern_chan.c | 8 +++++---
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1 file changed, 5 insertions(+), 3 deletions(-)
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diff --git a/lib/fuse_kern_chan.c b/lib/fuse_kern_chan.c
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index 5f77bbf..4cc9b73 100644
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--- a/lib/fuse_kern_chan.c
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+++ b/lib/fuse_kern_chan.c
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@@ -80,7 +80,10 @@ static void fuse_kern_chan_destroy(struct fuse_chan *ch)
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close(fuse_chan_fd(ch));
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}
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-#define MIN_BUFSIZE 0x21000
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+#define KERNEL_BUF_PAGES 32
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+
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+/* room needed in buffer to accommodate header */
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+#define HEADER_SIZE 0x1000
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struct fuse_chan *fuse_kern_chan_new(int fd)
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{
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@@ -89,7 +92,6 @@ struct fuse_chan *fuse_kern_chan_new(int fd)
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.send = fuse_kern_chan_send,
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.destroy = fuse_kern_chan_destroy,
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};
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- size_t bufsize = getpagesize() + 0x1000;
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- bufsize = bufsize < MIN_BUFSIZE ? MIN_BUFSIZE : bufsize;
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+ size_t bufsize = KERNEL_BUF_PAGES * getpagesize() + HEADER_SIZE;
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return fuse_chan_new(&op, fd, bufsize, NULL);
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}
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--
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2.9.3
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