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| author | Michael Brown | 2012-06-29 17:07:12 +0200 |
|---|---|---|
| committer | Michael Brown | 2012-06-29 17:07:12 +0200 |
| commit | a5c016d93ee24e851cd8752b014170a308f231da (patch) | |
| tree | 5dc41c4838463a891de906ac91c25917d32c5a73 /src/include/ipxe/iobuf.h | |
| parent | [tls] Request a maximum fragment length of 2048 bytes (diff) | |
| download | ipxe-a5c016d93ee24e851cd8752b014170a308f231da.tar.gz ipxe-a5c016d93ee24e851cd8752b014170a308f231da.tar.xz ipxe-a5c016d93ee24e851cd8752b014170a308f231da.zip | |
[iobuf] Relax alignment requirement for small I/O buffers
iPXE currently aligns all I/O buffers on a 2kB boundary. This is
overkill for transmitted packets, which are typically much smaller
than 2kB.
Align I/O buffers on their own size. This reduces the alignment
requirement for small buffers, while preserving the guarantee that I/O
buffers will never cross boundaries that might cause problems for some
DMA engines.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/include/ipxe/iobuf.h')
| -rw-r--r-- | src/include/ipxe/iobuf.h | 11 |
1 files changed, 0 insertions, 11 deletions
diff --git a/src/include/ipxe/iobuf.h b/src/include/ipxe/iobuf.h index 82c8b8896..8134ae76a 100644 --- a/src/include/ipxe/iobuf.h +++ b/src/include/ipxe/iobuf.h @@ -14,17 +14,6 @@ FILE_LICENCE ( GPL2_OR_LATER ); #include <ipxe/list.h> /** - * I/O buffer alignment - * - * I/O buffers allocated via alloc_iob() are guaranteed to be - * physically aligned to this boundary. Some cards cannot DMA across - * a 4kB boundary. With a standard Ethernet MTU, aligning to a 2kB - * boundary is sufficient to guarantee no 4kB boundary crossings. For - * a jumbo Ethernet MTU, a packet may be larger than 4kB anyway. - */ -#define IOB_ALIGN 2048 - -/** * Minimum I/O buffer length * * alloc_iob() will round up the allocated length to this size if |