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smb3: update default requested iosize to 4MB from 1MB for recent dialects
Modern servers often support 8MB as maximum i/o size, and we see some performance benefits (my testing showed 1 to 13% on write paths, and 1 to 3% on read paths for increasing the default to 4MB). If server doesn't support larger i/o size, during negotiate protocol it is already set correctly to the server's maximum if lower than 4MB. Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
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@ -799,6 +799,7 @@ compare_mid(__u16 mid, const struct smb_hdr *smb)
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* a single wsize request with a single call.
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*/
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#define CIFS_DEFAULT_IOSIZE (1024 * 1024)
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#define SMB3_DEFAULT_IOSIZE (4 * 1024 * 1024)
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/*
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* Windows only supports a max of 60kb reads and 65535 byte writes. Default to
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@ -280,6 +280,31 @@ smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
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return wsize;
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}
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static unsigned int
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smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
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{
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struct TCP_Server_Info *server = tcon->ses->server;
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unsigned int wsize;
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/* start with specified wsize, or default */
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wsize = volume_info->wsize ? volume_info->wsize : SMB3_DEFAULT_IOSIZE;
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wsize = min_t(unsigned int, wsize, server->max_write);
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#ifdef CONFIG_CIFS_SMB_DIRECT
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if (server->rdma) {
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if (server->sign)
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wsize = min_t(unsigned int,
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wsize, server->smbd_conn->max_fragmented_send_size);
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else
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wsize = min_t(unsigned int,
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wsize, server->smbd_conn->max_readwrite_size);
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}
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#endif
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if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
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wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
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return wsize;
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}
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static unsigned int
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smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
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{
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@ -306,6 +331,31 @@ smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
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return rsize;
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}
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static unsigned int
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smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
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{
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struct TCP_Server_Info *server = tcon->ses->server;
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unsigned int rsize;
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/* start with specified rsize, or default */
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rsize = volume_info->rsize ? volume_info->rsize : SMB3_DEFAULT_IOSIZE;
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rsize = min_t(unsigned int, rsize, server->max_read);
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#ifdef CONFIG_CIFS_SMB_DIRECT
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if (server->rdma) {
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if (server->sign)
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rsize = min_t(unsigned int,
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rsize, server->smbd_conn->max_fragmented_recv_size);
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else
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rsize = min_t(unsigned int,
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rsize, server->smbd_conn->max_readwrite_size);
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}
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#endif
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if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
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rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
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return rsize;
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}
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static int
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parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf,
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@ -3436,8 +3486,8 @@ struct smb_version_operations smb30_operations = {
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.downgrade_oplock = smb2_downgrade_oplock,
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.need_neg = smb2_need_neg,
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.negotiate = smb2_negotiate,
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.negotiate_wsize = smb2_negotiate_wsize,
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.negotiate_rsize = smb2_negotiate_rsize,
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.negotiate_wsize = smb3_negotiate_wsize,
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.negotiate_rsize = smb3_negotiate_rsize,
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.sess_setup = SMB2_sess_setup,
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.logoff = SMB2_logoff,
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.tree_connect = SMB2_tcon,
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@ -3540,8 +3590,8 @@ struct smb_version_operations smb311_operations = {
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.downgrade_oplock = smb2_downgrade_oplock,
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.need_neg = smb2_need_neg,
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.negotiate = smb2_negotiate,
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.negotiate_wsize = smb2_negotiate_wsize,
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.negotiate_rsize = smb2_negotiate_rsize,
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.negotiate_wsize = smb3_negotiate_wsize,
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.negotiate_rsize = smb3_negotiate_rsize,
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.sess_setup = SMB2_sess_setup,
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.logoff = SMB2_logoff,
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.tree_connect = SMB2_tcon,
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