mirror of https://gitee.com/openkylin/linux.git
943e942e62
nvme requires an sg table allocation for each request. If the request is large, then the allocation can become quite large. For instance, with our default software settings of 1280KB IO size, we'll need 10248 bytes of sg table. That turns into a 2nd order allocation, which we can't always guarantee. If we fail the allocation, blk-mq will retry it later. But there's no guarantee that we'll EVER be able to allocate that much contigious memory. Limit the IO size such that we never need more than a single page of memory. That's a lot faster and more reliable. Then back that allocation with a mempool, so that we know we'll always be able to succeed the allocation at some point. Signed-off-by: Jens Axboe <axboe@kernel.dk> Acked-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Christoph Hellwig <hch@lst.de> |
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| .. | ||
| Kconfig | ||
| Makefile | ||
| core.c | ||
| fabrics.c | ||
| fabrics.h | ||
| fault_inject.c | ||
| fc.c | ||
| lightnvm.c | ||
| multipath.c | ||
| nvme.h | ||
| pci.c | ||
| rdma.c | ||
| trace.c | ||
| trace.h | ||