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cxgbe(4): Do not use pack boundary > 512B unless it is explicitly

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requested.

This is a tradeoff between PCIe efficiency during large packet rx and
packing efficiency during small packet rx.

MFC after:	1 week
Sponsored by:	Chelsio Communications
This commit is contained in:
Navdeep Parhar 2020-02-03 23:30:39 +00:00
parent a9c4062a9a
commit 44c6fea82b
1 changed files with 7 additions and 1 deletions
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8
sys/dev/cxgbe/t4_sge.c
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@ -589,6 +589,9 @@ t4_sge_extfree_refs(void)
return (refs - rels);
}
/* max 4096 */
#define MAX_PACK_BOUNDARY 512
static inline void
setup_pad_and_pack_boundaries(struct adapter *sc)
{
@ -635,7 +638,10 @@ setup_pad_and_pack_boundaries(struct adapter *sc)
pack = fl_pack;
if (fl_pack < 16 || fl_pack == 32 || fl_pack > 4096 ||
!powerof2(fl_pack)) {
pack = max(sc->params.pci.mps, CACHE_LINE_SIZE);
if (sc->params.pci.mps > MAX_PACK_BOUNDARY)
pack = MAX_PACK_BOUNDARY;
else
pack = max(sc->params.pci.mps, CACHE_LINE_SIZE);
MPASS(powerof2(pack));
if (pack < 16)
pack = 16;