Date: Fri, 19 Jul 2019 18:39:19 +0000 (UTC) From: Warner Losh <imp@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r350146 - head/sys/dev/nvme Message-ID: <201907191839.x6JIdJdQ076540@repo.freebsd.org>
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Author: imp Date: Fri Jul 19 18:39:18 2019 New Revision: 350146 URL: https://svnweb.freebsd.org/changeset/base/350146 Log: Keep track of the number of retried commands. Retried commands can indicate a performance degredation of an nvme drive. Keep track of the number of retries and report it out via sysctl, just like number of commands an interrupts. Modified: head/sys/dev/nvme/nvme_private.h head/sys/dev/nvme/nvme_qpair.c head/sys/dev/nvme/nvme_sysctl.c Modified: head/sys/dev/nvme/nvme_private.h ============================================================================== --- head/sys/dev/nvme/nvme_private.h Fri Jul 19 18:38:47 2019 (r350145) +++ head/sys/dev/nvme/nvme_private.h Fri Jul 19 18:39:18 2019 (r350146) @@ -190,6 +190,7 @@ struct nvme_qpair { int64_t num_cmds; int64_t num_intr_handler_calls; + int64_t num_retries; struct nvme_command *cmd; struct nvme_completion *cpl; Modified: head/sys/dev/nvme/nvme_qpair.c ============================================================================== --- head/sys/dev/nvme/nvme_qpair.c Fri Jul 19 18:38:47 2019 (r350145) +++ head/sys/dev/nvme/nvme_qpair.c Fri Jul 19 18:39:18 2019 (r350146) @@ -393,6 +393,8 @@ nvme_qpair_complete_tracker(struct nvme_qpair *qpair, error = nvme_completion_is_error(cpl); retry = error && nvme_completion_is_retry(cpl) && req->retries < nvme_retry_count; + if (retry) + qpair->num_retries++; if (error && (print_on_error == ERROR_PRINT_ALL || (!retry && print_on_error == ERROR_PRINT_NO_RETRY))) { @@ -684,6 +686,7 @@ nvme_qpair_construct(struct nvme_qpair *qpair, uint32_ qpair->num_cmds = 0; qpair->num_intr_handler_calls = 0; + qpair->num_retries = 0; qpair->cmd = (struct nvme_command *)queuemem; qpair->cpl = (struct nvme_completion *)(queuemem + cmdsz); prpmem = (uint8_t *)(queuemem + cmdsz + cplsz); Modified: head/sys/dev/nvme/nvme_sysctl.c ============================================================================== --- head/sys/dev/nvme/nvme_sysctl.c Fri Jul 19 18:38:47 2019 (r350145) +++ head/sys/dev/nvme/nvme_sysctl.c Fri Jul 19 18:39:18 2019 (r350146) @@ -166,6 +166,7 @@ nvme_qpair_reset_stats(struct nvme_qpair *qpair) qpair->num_cmds = 0; qpair->num_intr_handler_calls = 0; + qpair->num_retries = 0; } static int @@ -199,6 +200,21 @@ nvme_sysctl_num_intr_handler_calls(SYSCTL_HANDLER_ARGS } static int +nvme_sysctl_num_retries(SYSCTL_HANDLER_ARGS) +{ + struct nvme_controller *ctrlr = arg1; + int64_t num_retries = 0; + int i; + + num_retries = ctrlr->adminq.num_retries; + + for (i = 0; i < ctrlr->num_io_queues; i++) + num_retries += ctrlr->ioq[i].num_retries; + + return (sysctl_handle_64(oidp, &num_retries, 0, req)); +} + +static int nvme_sysctl_reset_stats(SYSCTL_HANDLER_ARGS) { struct nvme_controller *ctrlr = arg1; @@ -249,6 +265,8 @@ nvme_sysctl_initialize_queue(struct nvme_qpair *qpair, "Number of times interrupt handler was invoked (will typically be " "less than number of actual interrupts generated due to " "coalescing)"); + SYSCTL_ADD_QUAD(ctrlr_ctx, que_list, OID_AUTO, "num_retries", + CTLFLAG_RD, &qpair->num_retries, "Number of commands retried"); SYSCTL_ADD_PROC(ctrlr_ctx, que_list, OID_AUTO, "dump_debug", CTLTYPE_UINT | CTLFLAG_RW, qpair, 0, @@ -299,6 +317,11 @@ nvme_sysctl_initialize_ctrlr(struct nvme_controller *c "Number of times interrupt handler was invoked (will " "typically be less than number of actual interrupts " "generated due to coalescing)"); + + SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO, + "num_retries", CTLTYPE_S64 | CTLFLAG_RD, + ctrlr, 0, nvme_sysctl_num_retries, "IU", + "Number of commands retried"); SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO, "reset_stats", CTLTYPE_UINT | CTLFLAG_RW, ctrlr, 0,
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