Make software iSCSI more configurable.
Move software iSCSI tunables/sysctls into kern.icl.soft subtree. Replace several hardcoded length constants there with variables. While there, stretch the limits to better match Linux' open-iscsi and our own initiator with new MAXPHYS of 1MB. Our CTL target is also optimized for up to 1MB I/Os, so there is also a match now. For Windows 10 and VMware 6.7 initiators at default settings it should make no change, since previous limits were sufficient there. Tests of QD1 1MB writes from FreeBSD over 10GigE link show throughput increase by 29% on idle connection and 132% with concurrent QD8 reads. MFC after: 3 days Sponsored by: iXsystems, Inc.
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@ -89,8 +89,6 @@ struct icl_pdu {
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#define ICL_CONN_STATE_DATA 4
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#define ICL_CONN_STATE_DATA 4
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#define ICL_CONN_STATE_DATA_DIGEST 5
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#define ICL_CONN_STATE_DATA_DIGEST 5
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#define ICL_MAX_DATA_SEGMENT_LENGTH (128 * 1024)
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#define ICL_NOCOPY (1 << 30)
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#define ICL_NOCOPY (1 << 30)
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struct icl_conn {
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struct icl_conn {
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@ -72,18 +72,29 @@ struct icl_soft_pdu {
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int error;
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int error;
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};
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};
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SYSCTL_NODE(_kern_icl, OID_AUTO, soft, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
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"Software iSCSI");
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static int coalesce = 1;
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static int coalesce = 1;
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SYSCTL_INT(_kern_icl, OID_AUTO, coalesce, CTLFLAG_RWTUN,
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SYSCTL_INT(_kern_icl_soft, OID_AUTO, coalesce, CTLFLAG_RWTUN,
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&coalesce, 0, "Try to coalesce PDUs before sending");
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&coalesce, 0, "Try to coalesce PDUs before sending");
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static int partial_receive_len = 128 * 1024;
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static int partial_receive_len = 256 * 1024;
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SYSCTL_INT(_kern_icl, OID_AUTO, partial_receive_len, CTLFLAG_RWTUN,
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SYSCTL_INT(_kern_icl_soft, OID_AUTO, partial_receive_len, CTLFLAG_RWTUN,
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&partial_receive_len, 0, "Minimum read size for partially received "
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&partial_receive_len, 0, "Minimum read size for partially received "
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"data segment");
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"data segment");
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static int sendspace = 1048576;
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static int max_data_segment_length = 256 * 1024;
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SYSCTL_INT(_kern_icl, OID_AUTO, sendspace, CTLFLAG_RWTUN,
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SYSCTL_INT(_kern_icl_soft, OID_AUTO, max_data_segment_length, CTLFLAG_RWTUN,
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&max_data_segment_length, 0, "Maximum data segment length");
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static int first_burst_length = 1024 * 1024;
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SYSCTL_INT(_kern_icl_soft, OID_AUTO, first_burst_length, CTLFLAG_RWTUN,
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&first_burst_length, 0, "First burst length");
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static int max_burst_length = 1024 * 1024;
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SYSCTL_INT(_kern_icl_soft, OID_AUTO, max_burst_length, CTLFLAG_RWTUN,
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&max_burst_length, 0, "Maximum burst length");
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static int sendspace = 1536 * 1024;
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SYSCTL_INT(_kern_icl_soft, OID_AUTO, sendspace, CTLFLAG_RWTUN,
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&sendspace, 0, "Default send socket buffer size");
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&sendspace, 0, "Default send socket buffer size");
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static int recvspace = 1048576;
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static int recvspace = 1536 * 1024;
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SYSCTL_INT(_kern_icl, OID_AUTO, recvspace, CTLFLAG_RWTUN,
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SYSCTL_INT(_kern_icl_soft, OID_AUTO, recvspace, CTLFLAG_RWTUN,
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&recvspace, 0, "Default receive socket buffer size");
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&recvspace, 0, "Default receive socket buffer size");
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static MALLOC_DEFINE(M_ICL_SOFT, "icl_soft", "iSCSI software backend");
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static MALLOC_DEFINE(M_ICL_SOFT, "icl_soft", "iSCSI software backend");
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@ -663,10 +674,8 @@ icl_conn_receive_pdu(struct icl_conn *ic, size_t *availablep)
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len = icl_pdu_data_segment_length(request);
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len = icl_pdu_data_segment_length(request);
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if (len > ic->ic_max_data_segment_length) {
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if (len > ic->ic_max_data_segment_length) {
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ICL_WARN("received data segment "
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ICL_WARN("received data segment "
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"length %zd is larger than negotiated "
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"length %zd is larger than negotiated; "
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"MaxDataSegmentLength %zd; "
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"dropping connection", len);
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"dropping connection",
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len, ic->ic_max_data_segment_length);
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error = EINVAL;
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error = EINVAL;
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break;
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break;
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}
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}
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@ -1230,7 +1239,7 @@ icl_soft_new_conn(const char *name, struct mtx *lock)
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#ifdef DIAGNOSTIC
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#ifdef DIAGNOSTIC
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refcount_init(&ic->ic_outstanding_pdus, 0);
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refcount_init(&ic->ic_outstanding_pdus, 0);
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#endif
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#endif
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ic->ic_max_data_segment_length = ICL_MAX_DATA_SEGMENT_LENGTH;
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ic->ic_max_data_segment_length = max_data_segment_length;
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ic->ic_name = name;
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ic->ic_name = name;
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ic->ic_offload = "None";
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ic->ic_offload = "None";
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ic->ic_unmapped = false;
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ic->ic_unmapped = false;
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@ -1280,10 +1289,6 @@ icl_conn_start(struct icl_conn *ic)
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* For sendspace, this is required because the current code cannot
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* For sendspace, this is required because the current code cannot
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* send a PDU in pieces; thus, the minimum buffer size is equal
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* send a PDU in pieces; thus, the minimum buffer size is equal
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* to the maximum PDU size. "+4" is to account for possible padding.
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* to the maximum PDU size. "+4" is to account for possible padding.
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*
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* What we should actually do here is to use autoscaling, but set
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* some minimal buffer size to "minspace". I don't know a way to do
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* that, though.
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*/
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*/
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minspace = sizeof(struct iscsi_bhs) + ic->ic_max_data_segment_length +
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minspace = sizeof(struct iscsi_bhs) + ic->ic_max_data_segment_length +
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ISCSI_HEADER_DIGEST_SIZE + ISCSI_DATA_DIGEST_SIZE + 4;
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ISCSI_HEADER_DIGEST_SIZE + ISCSI_DATA_DIGEST_SIZE + 4;
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@ -1520,10 +1525,10 @@ static int
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icl_soft_limits(struct icl_drv_limits *idl)
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icl_soft_limits(struct icl_drv_limits *idl)
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{
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{
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idl->idl_max_recv_data_segment_length = 128 * 1024;
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idl->idl_max_recv_data_segment_length = max_data_segment_length;
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idl->idl_max_send_data_segment_length = 128 * 1024;
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idl->idl_max_send_data_segment_length = max_data_segment_length;
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idl->idl_max_burst_length = 262144;
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idl->idl_max_burst_length = max_burst_length;
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idl->idl_first_burst_length = idl->idl_max_burst_length;
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idl->idl_first_burst_length = first_burst_length;
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return (0);
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return (0);
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}
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}
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