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![]() Currently for the TCMU, the ring buffer size is fixed to 64K cmd area + 1M data area, and this will be bottlenecks for high iops. The struct tcmu_cmd_entry {} size is fixed about 112 bytes with iovec[N] & N <= 4, and the size of struct iovec is about 16 bytes. If N == 0, the ratio will be sizeof(cmd entry) : sizeof(datas) == 112Bytes : (N * 4096)Bytes = 28 : 0, no data area is need. If 0 < N <=4, the ratio will be sizeof(cmd entry) : sizeof(datas) == 112Bytes : (N * 4096)Bytes = 28 : (N * 1024), so the max will be 28 : 1024. If N > 4, the sizeof(cmd entry) will be [(N - 4) *16 + 112] bytes, and its corresponding data size will be [N * 4096], so the ratio of sizeof(cmd entry) : sizeof(datas) == [(N - 4) * 16 + 112)Bytes : (N * 4096)Bytes == 4/1024 - 12/(N * 1024), so the max is about 4 : 1024. When N is bigger, the ratio will be smaller. As the initial patch, we will set the cmd area size to 2M, and the cmd area size to 32M. The TCMU will dynamically grows the data area from 0 to max 32M size as needed. The cmd area memory will be allocated through vmalloc(), and the data area's blocks will be allocated individually later when needed. The allocated data area block memory will be managed via radix tree. For now the bitmap still be the most efficient way to search and manage the block index, this could be update later. Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com> Signed-off-by: Jianfei Hu <hujianfei@cmss.chinamobile.com> Acked-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> |
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.. | ||
iscsi | ||
loopback | ||
sbp | ||
tcm_fc | ||
Kconfig | ||
Makefile | ||
target_core_alua.c | ||
target_core_alua.h | ||
target_core_configfs.c | ||
target_core_device.c | ||
target_core_fabric_configfs.c | ||
target_core_fabric_lib.c | ||
target_core_file.c | ||
target_core_file.h | ||
target_core_hba.c | ||
target_core_iblock.c | ||
target_core_iblock.h | ||
target_core_internal.h | ||
target_core_pr.c | ||
target_core_pr.h | ||
target_core_pscsi.c | ||
target_core_pscsi.h | ||
target_core_rd.c | ||
target_core_rd.h | ||
target_core_sbc.c | ||
target_core_spc.c | ||
target_core_stat.c | ||
target_core_tmr.c | ||
target_core_tpg.c | ||
target_core_transport.c | ||
target_core_ua.c | ||
target_core_ua.h | ||
target_core_user.c | ||
target_core_xcopy.c | ||
target_core_xcopy.h |